A device at bedtime was linked to worse sleep even unused

The short answer

A pooled analysis of 20 studies found that children with a screen-based device at bedtime, even one they were not actively using, had higher odds of inadequate sleep, poor sleep quality and daytime sleepiness. Access to a device in the bedroom was linked to worse sleep whether or not it was switched on.

What the evidence says

Carter, Rees, Hale, Bhattacharjee and Paradkar published their systematic review and meta-analysis in JAMA Pediatrics on 1 December 2016, pooling cross-sectional studies covering 125,198 children with an average age of 14.5. Bedtime use of a media device was associated with higher odds of inadequate sleep quantity (OR 2.17), poor sleep quality (OR 1.46) and excessive daytime sleepiness (OR 2.72). The finding the authors highlighted most was that access to a device without using it carried similarly elevated odds for the same three outcomes (OR 1.79, 1.53 and 2.27 respectively), meaning the device's mere presence in the sleep environment, not only screen use itself, tracked with worse sleep.

For context

These are pooled cross-sectional studies, so they show association at a point in time rather than proof that removing a device would fix a particular child's sleep. The authors' own recommendation was for a coordinated approach among teachers, health professionals and parents to reduce device access at bedtime, which is a stronger and more specific claim than merely limiting daytime screen minutes. It is worth reading this finding alongside the American Academy of Sleep Medicine's 2016 consensus statement on recommended sleep hours by age, which frames adequate sleep as tied to attention, learning, mood and physical health, giving a benchmark against which inadequate sleep in the meta-analysis can be judged.

A practical next step

Because access, not only use, is linked to worse sleep in this evidence, moving devices out of the bedroom overnight is one option worth considering as distinct from setting a screen-time limit earlier in the day.

• Do devices in your house charge in a bedroom overnight, whether or not they get used there?
• Is your child's device access at bedtime driven by habit, by messaging friends, or by using it as an alarm clock?
• Would a shared charging spot outside bedrooms be workable for your household, including for adults?

The evidence does not prove that a device in the room causes poor sleep on its own; light exposure, notifications, and the temptation to check one more message could all play a part. It does support treating bedtime device access, not just screen-time totals, as a distinct and testable variable in a family's sleep routine.