Doctors are telling parents to limit their kids' tweeting and texting, and also to keep smart phones and laptops out of their bedrooms.

A study from the American Academy of Pediatrics says unrestricted media use can have serious consequences, like too much media exposure, cutting into kids' sleep and their ability to pay attention.

A 2010 report says kids in the US between 8 and 18 spent an average of more than seven hours a day using some kind of entertainment media.

Some parents are scoffing at the recommendation, saying good luck trying to keep smartphones and tablets out of kids bedrooms.