Statement of Principles concerning chronic insomnia disorder (Balance of Probabilities) (No. 38 of 2019)

The instrument rests on a few technical concepts and thresholds that determine how claims will be assessed. The baseline clinical concept is the RMA's DSM-5 derived definition of chronic insomnia disorder (s6(2)). That definition requires: a predominant complaint of dissatisfaction with sleep quantity or quality with specified symptoms (difficulty initiating sleep, maintaining sleep, or early-morning awakening) (s6(2) subparagraph 1(i)-(iii)); clinically significant distress or impairment (s6(2) B); occurrence at least three nights per week (s6(2) C); persistence for at least three months (s6(2) D); occurrence despite adequate opportunity for sleep and not explained by inadequate circumstances (s6(2) E); and not better explained by, or occurring exclusively during, another sleep-wake disorder (s6(2) F).

Causation is expressed in probabilistic terms. Section 7 records the RMA's view that the available medical‑scientific evidence makes it "more probable than not" that chronic insomnia disorder and death from it can be related to relevant service. Section 8 operationalises this by setting out the alternative factors: the presence of at least one factor from the list, together with the requirement that it be related to relevant service under s9(1), is the RMA's formula for establishing connection on the balance of probabilities.

There are two temporal types of factors: those that relate to clinical onset and those that relate to clinical worsening. Subsections 8(1)-8(13) are factors that must exist before the clinical onset of chronic insomnia disorder. Subsections 8(14)-8(26) are the parallel factors for clinical worsening. Many factors are mirrored across onset and worsening, often with identical temporal windows (for example, clinically significant mental disorder within one year before onset or worsening at ss8(1) and 8(14)). The instrument specifies the temporal windows tightly: one year for many stressors and mental health conditions, three months for persistent pain and tinnitus, seven continuous days with last dose within 30 days for many drugs, and a two-month window for mefloquine exposure (ss8(1)-(26) and Schedule 1 definitions).

Definitions in Schedule 1 shape several important concepts used in the operative provisions. For example, what qualifies as a category 1A, 1B or category 2 stressor is set out with specific examples (Schedule 1 definitions). "Clinically significant disorder of mental health as specified" is a listed set of conditions including PTSD, depressive disorder, bipolar disorder, schizophrenia, substance use disorders and others, and the Schedule expressly states that ongoing management may involve regular visits but that evidence of actual management is not required to warrant the description (Schedule 1 definition of clinically significant disorder of mental health as specified, Note 1 and Note 2).

The instrument also incorporates cross-reference mechanics. Section 10 says that if a factor in s8 refers to an injury or disease covered by another Statement of Principles made under subsection 196B(3) of the VEA, then the factors in that other Statement of Principles apply in accordance with its terms as in force from time to time. That introduces a dynamic interplay where other SoPs can add specificity or conditions relevant to certain factors.

Finally, the instrument ties its operation to the statutory categories of service which define "relevant service" in Schedule 1: eligible war service other than operational service under the VEA, defence service other than hazardous service and British nuclear test defence service under the VEA, or peacetime service under the MRCA. This is the legal population to whom the instrument will be applied (Schedule 1 definition of relevant service).

This Statement of Principles affects people making claims for chronic insomnia disorder or death from chronic insomnia disorder under the specified veterans' compensation schemes, and decision makers and medical assessors who determine those claims. The instrument expressly applies to claims to which section 120B of the VEA or section 339 of the MRCA applies (s4). The Schedule1 definition of "relevant service" narrows the population to persons with eligible war service (excluding operational service), defence service (excluding hazardous service and British nuclear test defence service) under the VEA, and peacetime service under the MRCA. Therefore, the instrument is targeted to veterans and members within those legal service categories (Schedule 1 relevant service).

Claimants are those who have, or allege they have, chronic insomnia disorder as defined in s6(2). The definition of chronic insomnia disorder requires medical findings that are often documented by GPs, psychiatrists, sleep physicians, or other treating practitioners, so medical practitioners providing evidence are affected. The Schedule lists particular mental health diagnoses that qualify as "clinically significant disorder of mental health as specified" (for example, PTSD, depressive disorder, anxiety disorder, schizophrenia, substance use disorder) and those clinical diagnoses will affect the pool of evidence practitioners provide (Schedule 1 definition).

Service records custodians and administrative decision makers in the Department of Veterans' Affairs and other employing agencies are affected because they must determine whether an enumerated factor existed and whether it is related to relevant service as required by s9(1). Examples of important evidentiary sources are service records containing documentation of stressors, records of exposure to chemicals or drugs such as mefloquine, deployment-related incident reports, and records that document inability to access clinical management during or after service.

Family members and witnesses may be involved, because several factors require factual findings about traumatic events (category 1A or 1B stressors), severe childhood abuse perpetrated by close adults, or persistent life stressors (category 2 stressors). The instrument distinguishes eyewitness exposure (Schedule 1 definitions of corpse and eyewitness), and excludes exposure via public broadcasting or mass media, so family and on-site witnesses may be essential in proving a factor is met.

Medical-legal advisers and lawyers representing claimants or the Minister are affected by the instrument because it prescribes the particular elements that will be determinative for service connection. They will need to marshal contemporaneous clinical records, medication histories (the instrument lists specific drug classes in Schedule 1), and evidence of timing, as the factors are time-sensitive (for example, drug exposure windows, durations for persistent pain and tinnitus, and one-year windows for many stressors).

Finally, the Statement affects the Repatriation Medical Authority and decision makers by setting the RMA's medical position on causal linkage and by directing the criteria that decision makers will apply in the statutory claims processes where these SoPs are used. The instrument itself does not create new entitlements; instead, it provides the medical criteria used within the existing entitlement framework of the VEA and MRCA (s3-4 and s7).

This instrument does not create duties in the criminal law sense, nor does it set statutory rights independent of the VEA or MRCA. Instead, it creates evidentiary mechanics that bind how the medical question of connection between chronic insomnia disorder (or death from it) and relevant service is to be evaluated for claims within the VEA and MRCA frameworks. The key operational duty is on decision makers and medical assessors to apply the RMA's specified criteria: to find that the disorder is connected with service on the balance of probabilities only if at least one of the factors in s8 existed in the prescribed temporal relationship to onset or worsening and that the factor was related to relevant service under s9(1). Section 8 is explicit: "At least one of the following factors must exist before it can be said that, on the balance of probabilities, chronic insomnia disorder or death from chronic insomnia disorder is connected with the circumstances of a person's relevant service" (s8).

For claimants, the key right is the opportunity to establish service connection by adducing evidence that one or more of the enumerated factors existed and was related to service. The instrument supplies the specific evidentiary elements necessary to satisfy the RMA's medical test. For example, if a claimant can establish that a clinically significant mental health disorder that is one of the listed conditions existed within one year before clinical onset, and that that disorder is related to relevant service, then the claimant satisfies one of the mandatory factors for onset (s8(1) and Schedule 1 definition). Similarly, if a claimant can show treatment with a drug on the specified list for a continuous seven-day period with last dose within 30 days before onset, that satisfies s8(11) subject to the requirement of relation to service.

There is also a procedural limitation laid down in s9(2) that affects how claimants and decision makers may rely on certain factors. Subsections 8(14)-8(26), which relate to clinical worsening, "apply only to material contribution to, or aggravation of, chronic insomnia disorder where the person's chronic insomnia disorder was suffered or contracted before or during (but did not arise out of) the person's relevant service." That creates a rights constraint for claimants whose insomnia disorder arose out of service; those particular factors cannot be used in the instrument's terms to establish material contribution or aggravation where the disorder did arise out of service.

Section 10 creates a cross-application duty: where a factor in s8 refers to an injury or disease that is itself the subject of another SoP, then the factors in that other SoP "apply in accordance with the terms of that Statement of Principles as in force from time to time." This places a duty on decision makers to consult and apply other SoPs where relevant, and on practitioners to identify intersecting SoPs.

The instrument imposes evidential thresholds by time and nature rather than procedural burdens like filing deadlines. Important rights and duties therefore revolve around producing and evaluating time-stamped clinical records, drug histories (including last dose dates), documented exposure or stressor events, and records establishing relevant service. The Schedule clarifies definitions that shape those thresholds, for example what amounts to "persistent pain" or a "category 1B stressor", which informs what evidence will be material (Schedule 1 definitions).

The Statement of Principles itself does not create criminal offences, pecuniary penalties, licensing obligations, or independent enforcement mechanisms. The instrument is an administrative medical instrument made under subsection 196B(3) of the Veterans' Entitlements Act 1986 and intended to be applied within the VEA and MRCA claims processes (ss3-4). It prescribes medical criteria relevant to statutory entitlement processes, but it contains no penalty clauses, compliance fines, or enforcement powers.

Enforcement in practice is administrative and adversarial: decision makers within the Department of Veterans' Affairs or under the MRCA will apply this Statement of Principles as part of the medical causation analysis in claim determinations under the respective Acts. Where parties disagree about the application of the instrument to the facts of a particular claimant, recourse will be through the statutory appeals and merits review mechanisms established under the VEA and MRCA schemes; those mechanisms and any judicial review rights are governed by those Acts and not by this instrument itself. The instrument does not describe those appeal processes, nor does it specify sanctions for non-compliance with medical evidence requirements.

The instrument places evidentiary demands on claimants and medical practitioners, such as producing clinical diagnoses that meet the DSM-5 derived criteria (s6(2)) and proof that listed factors existed within the specified temporal windows (s8). Failure to produce that evidence will affect a claimant's ability to obtain a favourable finding under the RMA's specified tests. But such evidential failure is not a statutory penalty in this instrument; it is simply the consequence of not satisfying the required medical criteria.

For decision makers, the instrument is authoritative as a statement of the RMA's view on medical causation (s7). The RMA frames the standard evidence-based view that it is "more probable than not" that chronic insomnia disorder can be related to relevant service (s7). Application of the SoP's factors will therefore shape administrative outcomes, and the mechanism of enforcement of those outcomes is the statutory compensation and rehabilitation scheme under the VEA and MRCA, whichever is applicable to the claim (s4). The instrument itself does not create separate enforcement options or penalty regimes.

This Statement of Principles is a statutory instrument made under subsection 196B(3) of the Veterans' Entitlements Act 1986 and is explicitly tied to claims processes under that Act and the Military Rehabilitation and Compensation Act 2004. Section 4 states that the instrument applies to a claim to which section 120B of the VEA or section 339 of the MRCA applies. The instrument therefore operates within the existing statutory reaching power of those Acts; it neither adds nor subtracts from the substantive entitlement provisions in those statutes beyond providing a medical statement that decision makers will use when applying the Acts.

Section 10 provides an internal cross-instrument interaction mechanism. If a factor in s8 refers to an injury or disease that is the subject of another Statement of Principles made under subsection 196B(3) of the VEA, then the factors in that other Statement of Principles "apply in accordance with the terms of that Statement of Principles as in force from time to time." That means this instrument defers to the content of other SoPs where overlap exists, and it creates a requirement that decision makers consult and apply those other SoPs to determine the effect of an interrelated injury or disease. An example from the text is that s8 may refer to injury or disease covered by another SoP; in such cases, the other SoP's factors govern, not this instrument alone.

The Schedule 1 definitions tie the instrument to service-type categories used in the VEA and MRCA. "Relevant service" is defined by reference to eligibility categories under the VEA and MRCA, which will determine the pool of potential claimants and which statutory provisions govern their entitlements (Schedule 1 relevant service). This ties the medical criteria to the statutory definitions of service, and therefore to other legal doctrines and eligibility requirements contained in those Acts.

The instrument also incorporates external clinical standards by adopting DSM-5 diagnostic criteria for chronic insomnia disorder (s6(2) and Schedule 1 DSM-5 definition). That incorporation means medical assessment under this instrument will reference and apply accepted psychiatric diagnostic criteria, and any interaction with medical practice standards and professional obligations will be through that clinical standard.

The instrument's scope excludes certain service types by definition. The Schedule defines relevant service to exclude operational service under eligible war service and to exclude hazardous service and British nuclear test defence service under the VEA. Therefore the coverage of this SoP is narrower than the entire universe of veterans' service types; application to other service types would depend on other statutory provisions or SoPs.

Finally, the instrument is static only in its present terms but dynamic in reference to other SoPs "as in force from time to time" (s10). This introduces an ongoing interaction where amendments to other SoPs will affect how factors that refer to other injuries or diseases apply when they are relied upon in chronic insomnia disorder claims. The instrument does not itself modify other laws or SoPs, but it requires decision makers to apply other SoPs where factors overlap.

The instrument itself records its date and commencement. It is identified as No. 38 of 2019, dated 1 March 2019, and it commences on 25 March 2019 (ss1-2). It is made under subsection 196B(3) of the Veterans' Entitlements Act 1986 (s3). The text provided is the instrument as made; no amendments are recorded within the instrument text as provided. The Schedule and provisions reflect the instrument's drafting at the time of making.

Because section 10 refers to other Statements of Principles "as in force from time to time," the instrument anticipates that other SoPs may be amended independently; those amendments will affect how cross-referenced factors are applied in relation to chronic insomnia disorder factors that refer to other conditions. The instrument does not itself specify a mechanism or schedule for future amendments to this instrument, but as a statutory instrument under the VEA it can be remade or varied in accordance with the enabling statutory power in s196B(3) of the VEA. The text does not record earlier or later versions, nor does it list prior instruments.

There is no internal chronology or amendment log in the document text that indicates subsequent variations, repeal, or substitution. Users should treat the text as the 2019 instrument and check the official RMA or legislative instrument registers for any later amendments or superseding Statements of Principles. The instrument explicitly defers to other SoPs "as in force from time to time" for overlapping conditions (s10), which means that changes to other SoPs will interact with this instrument even if it itself remains unamended.

The Statement of Principles document as provided does not record any litigation history. It names no court decisions and cites no judicial authority. The text is an administrative medical determinations instrument and contains no case references. As such, there are no decisions, appeals, or judicial interpretations recorded in the instrument itself. Any litigation or merits review applying the instrument would appear in external case files, tribunal decisions or court judgments, none of which are included in the instrument text.

Because the instrument is designed to be used by decision makers in applying the VEA and MRCA, disputes over its application would arise in the normal administrative appeal and judicial review channels provided under those Acts. The instrument does not describe those procedures and does not contain or reference specific litigation outcomes. Practitioners seeking to understand how courts or tribunals have treated this SoP in practice must consult the records of relevant tribunals and courts; that material is not part of this instrument.

The instrument contains several technical points and potential pitfalls for practitioners and claimants that are rooted in its specific wording and definitional choices. Those items can materially affect whether a factor is found to exist, and whether it is related to relevant service.

1. Temporal precision and windows. Many factors are only relevant if they exist within tight windows before clinical onset or worsening. Clinically significant mental disorders and category 1 and 2 stressors are relevant if they existed within one year before clinical onset or worsening (ss8(1)-(4) and ss8(14)-(17)). Persistent pain and tinnitus must have been present for at least three months before onset or worsening (ss8(8), (9), (20), (21) together with Schedule 1 definitions). Drugs on the specified list must have been taken continuously for at least seven days with last dose within 30 days before onset or worsening (ss8(11), (23) and Schedule 1 specified list of drugs). Mefloquine has a separate two-month window (ss8(13), (25)). Accurate dates for onset, worsening, last dose, and duration are therefore critical; vague or inconsistent dates risk failing the temporal tests.

2. Definition of chronic insomnia disorder requires “adequate opportunity for sleep” (s6(2) E). Establishing that the sleep difficulty occurred despite adequate opportunity for sleep can be difficult. That element excludes cases where insomnia is explained by inadequate circumstances for sleep. Records addressing sleeping arrangements, shift patterns, deployments, or environmental factors will matter. The instrument does not define "adequate opportunity", so adjudicators must assess it on the evidence.

3. Drugs list includes many commonplace therapeutics. The specified list in Schedule 1 includes antidepressants (selective serotonin uptake inhibitors and serotonin and norepinephrine reuptake inhibitors), benzodiazepines, non-benzodiazepine hypnotics (Z-drugs), beta-blockers, corticosteroids (systemic), opiate analgesics, modafinil, methylphenidate, and others. Many veterans will have legitimate therapeutic exposure to these agents. To rely on ss8(11) or 8(23), the claim must show continuous treatment for at least seven days and last dose within 30 days before onset or worsening. For ss8(12) and 8(24) a more individualised showing is required that the drug is capable of producing a prominent and severe disturbance in sleep, that the drug was associated in the individual with emergence or worsening of symptoms, and the last dose was within 30 days. Clinical records must therefore document both exposure and causally linking observations.

4. Eyewitness and corpse definitions narrow traumatic-event coverage. Category 1B stressors include being an eyewitness to a corpse or critically injured casualty, but Schedule 1 excludes seeing a closed body bag or viewing a body in an open-casket coffin. The eyewitness definition excludes persons who were exposed only via media. That can exclude commonly asserted traumatic exposures that were only experienced via broadcast or post-event reporting.

5. Clinically significant mental disorders: management not required. The Schedule indicates that warranting ongoing management does not require that actual management was received or given (Schedule 1 Note 2). This reduces an evidentiary pitfall where absence of records of treatment might otherwise count against a claimant. On the other hand, the descriptor requires a condition that is "of sufficient severity to warrant ongoing management" which is a clinical judgement that can be contested.

6. Scope of aggravation factors. Section 9(2) limits the application of the worsening factors (ss8(14)-(26)) to situations where the insomnia existed before or during, but did not arise out of, the person's relevant service. Practitioners must note that ss8(14)-(26) are not available in the terms of this SoP for material contribution or aggravation if the insomnia disorder was itself caused by relevant service.

7. Severe childhood abuse time element. The instrument treats severe childhood abuse as a factor if experienced before clinical onset (s8(5)), but Schedule 1 defines it specifically as harm while a child aged under 16 years and identifies particular perpetrators. Proof of age at time of abuse and identification of perpetrator categories are therefore necessary. The Schedule's narrow perpetrator list could exclude other forms of harm.

8. Inability to obtain appropriate clinical management as a factor. Subsection 8(26) lists inability to obtain appropriate clinical management for chronic insomnia disorder as a factor for clinical worsening. Practitioners must document attempts to obtain care and the reasons care was not available, and decision makers must assess whether the inability is attributable to relevant service.

9. Cross-referenced SoPs may alter the analysis. Section 10 requires application of other SoPs where a factor refers to a condition covered elsewhere; those other SoPs may impose additional criteria not present here. Lawyers must check for and apply other SoPs "as in force from time to time."

10. Death inclusion is narrow. The instrument includes death from chronic insomnia disorder where a terminal event or condition was contributed to by the person's chronic insomnia disorder (s6(3) and Schedule 1 terminal event definition). The Schedule lists examples such as pneumonia, respiratory failure, cardiac arrest, circulatory failure, and cessation of brain function. Establishing contribution from insomnia to such terminal events requires robust clinical evidence.

Failure to account for any of these "gotchas" can lead to erroneous causal conclusions. Detailed, time-stamped clinical, medication, service and incident records are necessary to match the instrument's precise requirements.

Compliance here means preparing, providing and assessing the evidence necessary to satisfy the RMA's criteria. For claimants and practitioners the practical steps are concrete.

1. Clinician documentation of DSM-5 criteria. To meet s6(2), clinicians should document the DSM-5 elements: predominant complaint and specific insomnia symptoms (difficulty initiating, maintaining, early-morning awakening), frequency (at least three nights per week), duration (at least three months), functional impairment or distress, evidence that the symptoms occur despite adequate opportunity for sleep, and exclusion of other sleep-wake disorders. Use of structured sleep assessments, sleep diaries, and clinical sleep studies as relevant will assist in establishing these elements. Record explicit dates for onset and any subsequent worsening.

2. Establish precise onset and worsening dates. Many factors are time sensitive. Record the date or period when the insomnia first met the DSM-5 threshold and any dates when clinical worsening occurred. Where exact dates are unavailable, produce contemporaneous clinical notes that give the best possible estimate supported by other records. Time-stamped workplace or deployment records, incident reports and hospital records can corroborate these dates.

3. Medication histories with continuity and last dose dates. For factors ss8(11), (12), (23) and (24), document the drug name, class, start and stop dates, evidence of continuous use for at least seven days, and the date of last dose. Where asserting the more specific drug-induced criteria (ss8(12), (24)), note clinician observations linking the drug to the onset or worsening, and any dechallenge or rechallenge evidence. For mefloquine, document the date(s) of intake within the two-month window specified in ss8(13) and (25).

4. Mental health diagnoses and management evidence. For ss8(1) and (14), document the nature and timing of any clinically significant mental disorder listed in the Schedule. The Schedule allows that a condition may be described as warranting ongoing management even in the absence of actual management (Schedule 1 Note 2), but clinical records showing severity, symptomatology, and clinical judgements about ongoing management will strengthen the claim. Record dates of onset and whether the mental disorder preceded insomnia onset or worsening.

5. Document stressors with specificity. For category 1A, 1B and category 2 stressors, provide detailed descriptions, dates, locations, and identifying witnesses where available. For 1B stressors that involve corpses or critically injured casualties, ensure records show direct eyewitness exposure; media exposure alone is excluded. For category 2 stressors, provide evidence of chronicity and ongoing distress, such as contemporaneous reports or medical notes documenting the effect on functioning.

6. Record persistent pain and tinnitus durations and impact. For ss8(8), (9), (20), and (21), document that persistent pain or tinnitus existed for at least three months before onset or worsening, and show interference with work, leisure or daily living in the terms of the Schedule 1 definitions. Use clinical notes, pain management referrals, analgesic prescriptions, or audiology reports.

7. Evidence of pregnancy. For ss8(10) and (22), document the pregnancy status at the time of onset or worsening, with dates and obstetric records.

8. Severe childhood abuse. For s8(5), gather evidence that the abuse occurred before age 16 and that the perpetrator was a parent, care provider, adult worker, or other adult in contact with the child, in accordance with the Schedule definition. Records may include child protection investigations, historical medical records, police records, witness statements, or contemporaneous notes.

9. Demonstrate relation to relevant service. Section 9(1) requires that any factor relied upon must be related to relevant service. Evidence linking the factor to service may include service records, deployment logs, incident reports, statements from fellow service members, and contemporaneous command or medical records. The Schedule's restricted definition of relevant service will determine whether the claimant falls within the scope of the instrument.

10. For clinical worsening of pre-existing insomnia, note s9(2). Where a claimant seeks to show material contribution or aggravation under ss8(14)-(26), ensure the insomnia disorder was suffered or contracted before or during service and did not arise out of service, because these subsections "apply only" in that limited circumstance.

11. Cross-check other SoPs. If any factor refers to another injury or disease covered by a separate Statement of Principles, identify that SoP and apply its factors "as in force from time to time" consistent with s10. Obtain and apply the current version of the other SoP.

12. Prepare for evidentiary gaps. The Schedule allows that a clinically significant mental disorder may be said to warrant ongoing management without proof of actual management (Schedule 1 Note 2), but other factors often require positive documentary evidence. Where records are sparse, collect witness statements, contemporaneous non-medical records and any available administrative documentation to corroborate dates and events. For inability to obtain appropriate clinical management (s8(26)), document attempts to access care and reasons for denial or non‑availability.

13. For death claims, document contribution. Where death is alleged to have been contributed to by chronic insomnia disorder, obtain clinical opinions that connect insomnia with the terminal event named in Schedule 1 (for example, pneumonia, respiratory failure, cardiac arrest). Given the Schedule’s examples, clinical causation evidence will be necessary to show contribution.

14. Use precise language in expert reports. Experts should reference the instrument directly, identify which subsection(s) are said to be met, state the factual bases and date ranges, and give an opinion on whether the factor was related to the person’s relevant service. Where a factor depends on individual susceptibility (for example, drug-capable-of-producing-disturbance in sleep in ss8(12) or (24)), explain the pharmacology and the individual’s reaction as documented in the records.

15. Administrative practice. Decision makers should apply s8 and s9 strictly: find connection on the balance of probabilities only if at least one relevant factor exists in its temporal window and is related to relevant service. Where a factor points to another SoP under s10, decision makers should consult and apply that other SoP.

Following these steps aligns evidence and procedure with the instrument's precise requirements and reduces the risk that a claim will fail for lack of the specific elements the RMA has determined are necessary to establish connection on the balance of probabilities.