Experts recommend limiting use of small screen devices, reports HealthDay.

A study of more than 2,000 elementary and middle-school students found that having a smartphone or tablet in the bedroom was associated with less weekday sleep and feeling sleepy in the daytime.

“Studies have shown that traditional screens and screen time, like TV viewing, can interfere with sleep, but much less is known about the impacts of smartphones and other small screens,” said study lead author Jennifer Falbe, of the School of Public Health at the University of California, Berkeley.