Self-injurious behavior and sleep disturbance in adults with developmental disabilities.

J et al. watched the adults who lived in a state facility. Half hurt themselves; half did not.

Staff wrote down when each person slept for one month. The two groups were the same age and disability level.

Adults who self-injured slept 52 minutes less each night. Their bedtimes and wake times jumped around far more.

More self-injury was linked to more night-to-night swings in sleep.

Prosperi et al. (2017) saw the same sleep-and-self-injury link in preschoolers with autism. The pattern starts young and lasts into adulthood.

Totsika et al. (2010) found no extra behavior problems in older adults with autism once daily-living skills were counted. That study did not look at sleep, so the two papers do not clash—they just focus on different parts of the picture.

Yamashiro et al. (2019) showed adults with autism in day services take more psychotropic meds. Poor sleep may be one reason doctors add these drugs.

If you serve adults who hit or bite themselves, ask about sleep first. A simple log for one week can show short or chaotic nights. Fixing sleep—through bedtime routines, pain checks, or melatonin—may drop daytime self-injury without extra medication.