Researching sleep deprivation and judgment for fiction
Crime fiction lives or dies by the decisions characters make under pressure. When I write the Thorkild Aske series, I need to understand how exhaustion warps the choices a person makes in a tight spot. Sleep deprivation research gives me a vocabulary for those errors, and it lets me write scenes that feel earned rather than convenient.
Australia offers a rich laboratory for this kind of study. The fly-in fly-out workforce in the Pilbara and Bowen Basin often works brutal rosters that scramble sleep for weeks at a time. Long-haul truckers crossing the Nullarbor Plain push through days on little rest. Emergency room staff in Sydney and Melbourne work overnight shifts that flatten circadian rhythms. These are the people whose experiences help me ground fictional characters in something real.
This piece walks through the research process I rely on: the scientific sources, the interviews, the translation into character behaviour, and the Australian contexts that keep the work honest.
The scientific literature on sleep loss
Academic journals remain my first stop when I need hard data. Sleep research units in Adelaide and Sydney have published studies tracking how judgment degrades after 24 hours awake. The findings are precise and sometimes grim, which is exactly what a crime novel needs.
Medical textbooks provide the terminology. Words like psychomotor vigilance and executive function sound clinical, so I move them into action on the page. A character who cannot weigh risks is more interesting than one who simply feels tired.
| Hours slept in 24 hours | Cognitive impact on judgment | Behavioural marker |
|---|---|---|
| 7–9 | Baseline risk assessment | Stable, measured choices |
| 5–6 | Reduced situational awareness | Irritability, small errors |
| 3–4 | Impaired moral reasoning | Risky behaviour, slower reactions |
| 0–2 | Severe dissociation, poor impulse control | Hallucinations, volatile decisions |
I keep a version of this table nearby when plotting. If a scene requires Aske to make a terrible call, I check what stage of sleep loss he is in and what the research says actually happens at that stage. The table stops me from writing a tired character who still has the focus of a rested detective.
Interviews and lived experience
Papers tell me what should happen. People tell me what does happen. I talk to shift workers, paramedics, and Defence Force personnel whenever I can. Their stories are messier than the journals, and messier is better for fiction.
In Western Australia, I have spoken with FIFO miners who describe the "roster fog" that settles after day three of a 12-hour swing. In Brisbane, I have listened to hospital registrars explain how a 14-hour night shift bends their sense of time. One nurse in Perth told me she could not tell the difference between her pager and the monitor alarm by hour ten. That detail went straight into a chapter.
These conversations do more than provide colour. They correct the small errors that readers notice. A character who has been awake for 30 hours does not yawn politely and reach for coffee. He reads a street sign three times and still gets the number wrong.
Translating research into character behaviour
Once the research is in hand, the work is to move it from the page into the scene. The shift is mostly about stripping jargon and replacing it with sensory cues. A reader does not need to know the term micro-sleep. The reader needs to see a character stare at a door handle and forget why he reached for it.
Outside the medical literature, I also learn from character studies in unexpected places. A Beetee character analysis from a fan blog, for instance, breaks down how a strategic mind operates when pushed to the edge. Reading how others parse pressure helps me write it more accurately.
Fatigue also changes what a person notices. A sleep-deprived detective misses the small things that break a case. He walks past the overturned bin. He ignores the car with the wrong plates. The environment looks flat, stripped of colour and weight. That flattening is useful for pacing. It lets me slow a scene down without padding it.
For more on how environment shapes mood and menace in the Aske books, I have written about my approach to foreshadowing through nature elsewhere on the site.
Australian contexts and readers
Writing for an Australian audience means thinking about how sleep deprivation reads in a local context. Australian readers recognise the language of FIFO rosters and long shifts on the mines. They know what a "swing" means in Kalgoorlie. They know the particular exhaustion of a Sydney summer night when the power goes out and the ceiling fan stops.
Australian publishers, such as Text Publishing and Allen & Unwin, have been generous in bringing the Aske series to local readers. I have appeared at the Sydney Writers' Festival and the Melbourne Writers Festival, where audiences often ask about the technical side of police work. Sleep is part of that conversation. A detective on a 36-hour call in a novel needs to behave like a detective on a 36-hour call in Brisbane or Darwin, not like a character in a Scandinavian procedural.
Reliable signals and common pitfalls
Research helps when it is applied with care. The biggest mistake is treating sleep deprivation as a simple mood shift. It is a cognitive condition with measurable effects on judgment. Writers who get this wrong have characters making brilliant deductions after 48 hours awake. That breaks the contract with the reader.
Another error is confusing tiredness with sleep loss. A person who has not slept for two days is not merely tired. He is operating with a different brain. The brain makes different choices. It weighs risk differently. It prioritises differently.
Key behaviours to portray accurately
- Slower reaction times, especially under sudden stress
- Flattened emotional response, or sudden emotional volatility
- Reduced ability to interpret facial cues
- Poor impulse control in moments of high stakes
Common mistakes to avoid
- The "tired but sharp" detective who performs at peak after minimal sleep
- Hallucinations appearing after only one bad night
- Characters making complex moral calculations while severely sleep-deprived
When I am drafting a scene that turns on a character's judgment, I open the research, check the table, and ask what a real shift worker has told me about hour 22 of a wakeful stretch. The answer rarely lets me write the convenient choice. It usually points toward the harder, less flattering choice, and that is the choice the reader will believe.