Sleep in Autistic and ADHD Children

It is 10:40 p.m. and your child is still awake, or they fell asleep at 7 and were up at 4. Sleep is the problem that makes every other problem worse, for them and for you. The good news is that the boring stuff works better than the products, and Canada's guidance on melatonin just got clearer.

Why sleep is so hard for these kids

Sleep problems are the rule, not the exception. The Canadian Paediatric Society's 2025 position statement on sleep in children with neurodevelopmental disabilities puts the prevalence of sleep problems at 80% or more, and its autism guidance describes late sleep onset, frequent night and early waking and short sleep in 50% to 80% of autistic children. ^{1, 2}

The causes stack:

• Body clock differences. A 2024 study using wrist monitors in 87 autistic children found more movement during sleep and patterns suggesting shifted melatonin timing, compared with 30 typically developing children. Those with co-occurring ADHD showed the most night-time movement and later sleep timing. ⁵
• Sensory load. Sleep concerns and sensory reactivity differences travel together in autism. A 2022 scoping review of 24 studies found that tactile sensitivity in particular predicted sleep disturbance. ⁶ Seams, tags, sheet texture, a ticking clock, a streetlight: these are not fussiness, they are input.
• Interoception. A child who does not feel tired, or does not connect "tired" to "bed," needs the routine to do that connecting for them. See the sensory page.
• Daily patterns. Note whether difficult days and sleep concerns coincide; this observation does not identify a mechanism. See the support plan.
• Medical causes. Reflux, constipation, iron deficiency, enlarged tonsils and sleep apnea all disturb sleep and are easy to miss in a child who cannot say what hurts. The CPS asks doctors to consider these before anything else. ^{1, 2}

Routines matter more than gadgets

The CPS is direct: behavioural management is the first line of intervention once medical causes have been considered, and most sleep issues can be addressed through better sleep habits combined with behavioural strategies that respect the family's culture and priorities. ^{1, 2}

For a plan suited to your family, ask your clinician about consistent routines, the bedroom environment, and changes that respect your child’s needs. The CPS autism guidance recommends avoiding screens in the hour before bed. ² See screens.

You can bring a record of sleep times, wakings and concerns to that conversation. We do not prescribe a fixed recovery period, deep-pressure routine, or expected number of nights before improvement.

Melatonin: decent evidence, now a doctor conversation

Melatonin is the most studied sleep medication for children, and the CPS describes it as well tolerated in short-term use, with consistent findings that it shortens the time to fall asleep and often lengthens total sleep. ¹ It is also widely prescribed for autistic children with insomnia.

Two things have changed in Canada that parents should know:

1. Since June 2, 2026, melatonin for any sleep-related use in children under 18 is a prescription drug under Health Canada's Prescription Drug List. Before that, only the licensed product for autistic children and children with Smith-Magenis syndrome required a prescription; over-the-counter adult products were being used off-label. Health Canada's reason is that a practitioner should rule out other conditions, guide sleep habits and set the dose. ³
2. Health Canada's earlier safety review (2015) found conflicting evidence about neurological side effects in children, and asked parents to consult a healthcare professional before use, especially for children with other medical conditions or on other medications. ⁴

The CPS guidance for prescribers: try behavioural strategies first; when melatonin is used, start low (the statement cites 1 to 3 mg), give it 30 to 60 minutes before the desired sleep time, use it with medical supervision, and re-evaluate periodically. ¹ What to ask at the appointment: "Have we ruled out medical causes? What dose and timing? When do we review it? What is the plan to come off it?" Confirm current rules and coverage on the official pages before acting; they change.

Movement and sleep: the honest link

Parents often hear "tire them out." The evidence is more modest. A 2025 systematic review of exercise and sleep in ADHD found that self-reported sleep improved, but a meta-analysis of wearable-measured sleep in 131 participants showed no significant change in sleep duration. ⁷ The honest claim is "more rested," not "more hours."

The studies listed here do not establish why daytime movement might affect sleep for a particular child. Keep the practical question separate: discuss persistent sleep problems with their clinician. See movement and the brain.

Sensory tools: what the studies show

The 2022 scoping review found only a handful of sensory-focused sleep interventions. Parent-delivered massage and touch routines and individualised swim programs showed promise in small studies. Weighted blankets were liked by parents but showed minimal effect on objective sleep measures. ⁶ Discuss the suitability of any weighted or sensory product with a qualified clinician.

Your sleep too

Your sleep matters too. If there are two adults, split nights. If there is one, ask a relative for one morning a week. This is part of the plan; see parent burnout and co-regulation first.

When to see the doctor

Bring a two-week sleep log (bedtime, time asleep, wakings, wake time, naps) to your family doctor, pediatrician or CLSC nurse if your child snores or gasps, seems in pain at night, is exhausted in the day, or if sleep concerns persist. In Quebec, the CLSC can also connect you with a psychoeducator for the behavioural side; Agir tôt covers children under 7.

This week

Sources

1. Sleep matters: supporting healthy sleep for children and youth with neurodevelopmental disabilities (2025) ↩1 ↩2 ↩3 ↩4 ↩5
2. Post-diagnostic management and follow-up care for autism spectrum disorder (2019) ↩1 ↩2 ↩3 ↩4
3. Notice of amendment: Health Canada has changed the Prescription Drug List qualifier related to pediatric melatonin use (2026) ↩1
4. Summary safety review: melatonin, review of the safety of melatonin in children and adolescents (2015) ↩1
5. Sleep problems and circadian rhythm functioning in autistic children, autism with co-occurring ADHD, and typically developing children (2024) ↩1
6. Sleep, sensory integration/processing, and autism: a scoping review (2022) ↩1 ↩2
7. Effectiveness of exercise on sleep quality in attention deficit hyperactivity disorder: a systematic review and meta-analysis (2025) ↩1
8. The Agir tôt program: early screening to better address children's needs (2026)