A comparative study of circadian rhythm functioning and sleep in people with Asperger syndrome.

Hare et al. (2006) compared sleep and circadian rhythms in adults with Asperger syndrome to neurotypical adults. They used wrist actigraphy, a watch-like device that tracks movement, to measure sleep for multiple nights.

The study looked at sleep efficiency, total sleep time, and circadian rhythm strength. Participants wore the actigraphs continuously in their normal home settings.

Adults with Asperger syndrome had much worse sleep than controls. Their sleep efficiency was dramatically lower, meaning they spent more time awake in bed.

The Asperger group also showed weaker circadian rhythms. Their body clocks had smaller amplitude, like a dimmer light switch compared to the bright on-off pattern seen in neurotypical adults.

Lee et al. (2022) pooled 49 studies and found sleep problems predict worse daytime functioning across all areas in autistic people. Julian's 2006 actigraphy data is one of the early bricks in this wall of evidence.

Day et al. (2021) extended the finding by showing poor sleep plus high stress slashes quality of life for autistic adults. Where Julian showed the deficit exists, J showed it matters for real-world happiness.

Kuenzel et al. (2021) surveyed autistic adults in the UK and found most dislike current sleep meds. Julian's paper helps explain why demand for better treatments is so high - the sleep deficits are large and measurable.

If you work with autistic adults, treat sleep screening as routine. Ask about bedtime, wake time, and how rested they feel. Poor sleep can amplify daytime challenges, so catching it early gives you a powerful lever. Simple tools like sleep diaries or actigraphy watches can guide referrals to sleep clinics or behavioral interventions.