Shift Work, Circadian Rhythms, and Neurodivergence: A Systemic Problem Health Services Need to Address

Neurodivergent nurses sustain Australian health services across every shift pattern, and the strengths they bring to that work — pattern recognition under pressure, sustained attention in complex care, empathy grounded in lived experience — are not the question. The structural question is whether shift design accounts for the biology of the workforce doing the work. Shift work is a structural feature of nursing employment, and for nurses with neurocognitive profiles such as ADHD it creates specific challenges that standard roster design does not account for. Circadian rhythm differences — variations in the timing of the body’s natural sleep-wake cycle — are strongly associated with ADHD. Delayed sleep-wake phase disorder, in which the major sleep period runs significantly later than conventional schedules, is the most common circadian rhythm sleep-wake disorder and usually emerges in adolescence and persists into adulthood (Nesbitt 2018). It is markedly over-represented in ADHD: adult ADHD is associated with delayed circadian rhythmicity analogous to delayed sleep phase disorder (Snitselaar et al. 2017), with delayed sleep-wake timing reported in up to 78% of people with ADHD and the evening rise in melatonin (dim-light melatonin onset) delayed by roughly 90 minutes in adults (Luu and Fabiano 2025). This represents a fundamental mismatch between the biological timing needs of many neurodivergent nurses and the demands of standard shift scheduling.

What Shift Work Means for Neurodivergent Nurses

Delayed sleep phase tendencies — where a person’s internal clock runs significantly later than conventional schedules — create a fundamental mismatch with early-morning shift patterns. For a nurse with these tendencies, a 6am or 7am start is biologically equivalent to starting work in the middle of the night. The consequences — fatigue, reduced alertness, impaired concentration — are not a matter of willpower or sleep hygiene. They are the result of working against a biological rhythm that cannot simply be adjusted through an earlier bedtime. Shift work already constitutes a recognised occupational health risk in nursing. For nurses with delayed sleep phase tendencies, early-morning scheduling compounds that risk significantly, and rapid rotation between early, late, and night shifts imposes additional circadian disruption on top of an already misaligned baseline. The adaptive labour of absorbing that disruption often falls to the individual nurse — yet shift design is where much of it could be eased.

Where Employers Can Make a Difference

Circadian rhythm differences associated with a neurocognitive profile may constitute a disability under the Disability Discrimination Act 1992 (Cth), particularly where they substantially affect a nurse’s ability to work standard shift patterns without significant health consequences. Where that is the case, the law expects employers to consider reasonable adjustments to shift scheduling, and there is often genuine scope to make them — for example, avoiding mandatory early-morning starts, providing greater consistency in shift timing, or allowing input into roster design. The law only asks for changes that are reasonable, and roster flexibility is often well within that — particularly in organisations that already offer scheduling flexibility for other staff for other reasons.

Health services that want to keep their neurodivergent nurses can look at whether their scheduling practices reflect this evidence. Safe Work Australia’s model Code of Practice on Managing Psychosocial Hazards at Work (2022) identifies fatigue management as a workplace health obligation. Designing rosters that work with people’s biology, rather than against it, supports the whole workforce, not only neurodivergent staff — and employers are well placed to lead that change.

The compounding effect of shift work on wellbeing is explored in Burnout and Moral Injury in Neurodivergent Nurses. The legal framework requiring employers to consider reasonable adjustments to rostering is covered in Reasonable Adjustments in Nursing: What Australian Law Actually Requires.

References

Disability Discrimination Act 1992 (Cth).

Luu, B., & Fabiano, N. (2025). ADHD as a circadian rhythm disorder: evidence and implications for chronotherapy. Frontiers in Psychiatry, 16, 1697900. https://doi.org/10.3389/fpsyt.2025.1697900

Nesbitt, A. D. (2018). Delayed sleep-wake phase disorder. Journal of Thoracic Disease, 10(Suppl 1), S103–S111. https://doi.org/10.21037/jtd.2018.01.11

Safe Work Australia. (2022). Model Code of Practice: Managing psychosocial hazards at work. Australian Government.

Snitselaar, M. A., Smits, M. G., van der Heijden, K. B., & Spijker, J. (2017). Sleep and circadian rhythmicity in adult ADHD and the effect of stimulants. Journal of Attention Disorders, 21(1), 14–26. https://doi.org/10.1177/1087054713479663

This post contains general information only and does not constitute legal, medical, or professional advice. Information is accurate to the best of the author’s knowledge at the time of publication. For advice specific to your situation, please consult an appropriately qualified professional.