Staying up late to scroll through social media and catch up with friends on phones may be second nature for many teens. But the habit comes at a cost: Forty-three percent of parents say their teens struggle to fall asleep — or wake up and can’t get back to sleep — according to the latest University of Michigan C.S. Mott Children’s Hospital National Poll on Children’s Health.

More than half of parents of teens with sleep troubles think electronics are to blame. Once they hit puberty, adolescents need eight to 10 hours of sleep per night, but just over a third of American teens say they are getting at least eight hours on a typical school night.