A new study finds that young people who use the most bedtime media, from cell phones to video games, were more likely to have mood or learning problems.
Some also had trouble falling asleep, while others had daytime sleepiness.
The children in the study were treated at the JFK Medical Center Sleep Lab in New Jersey.
According to the report, they sent an average of 34 texts or emails a night, some sent four hours after bedtime.
The disruptions did not end there, as the children were awakened by their devices on average once per night.