Brief report: melatonin facilitates sleep in individuals with mental retardation and insomnia.

Researchers gave 0.1 mg or 3.0 mg of melatonin to the adults with intellectual disability and chronic insomnia.

Each person tried both doses and a sugar pill, in random order, 30 minutes before bedtime.

Sleep was tracked with wrist monitors and blood draws for melatonin levels.

Both tiny and regular doses raised night-time melatonin to normal range.

Sleep efficiency jumped from 69 % to 85 %—clients spent more time asleep while in bed.

The low 0.1 mg dose worked as well as the high 3.0 mg dose, with no morning grogginess.

Neuringer et al. (2007) later pooled earlier studies and agreed melatonin shortens sleep onset in people with ID, but warned most proofs were small or lacked controls—Reid et al. (2003) is one of the few solid RCTs they counted.

Einfeld et al. (1996) showed that severe sleep problems are near-universal in this group; Reid et al. (2003) proves the problem is treatable.

Rzepecka et al. (2011) tied poor sleep to daytime challenging behaviour; fixing sleep with melatonin may therefore cut aggression and self-injury.

Chu et al. (2009) found child sleep loss drains mothers’ mental health; helping the client sleep could give the whole family relief.

If you support adults with ID who lie awake for hours, a 0.3 mg melatonin capsule 30 min before lights-out is a cheap, low-risk tool to test. Pair it with simple sleep-hygiene cues—dim lights, no screens—and track night-waking data for two weeks. Better sleep can boost daytime learning readiness and reduce problem behaviour maintained by exhaustion.