Here are common reasons

Educated whites most likely to exceed drinking recommendations, British study finds

Study reassuring for people with 'mild cognitive impairment,' experts say

The more they watch, the greater the sleep loss

Study found they were more than twice as likely to end up in ER, five times more likely to be hospitalized

The more they watch, the greater the sleep loss

Study found they were more than twice as likely to end up in ER, five times more likely to be hospitalized

Review covered 2000 to 2010, so doesn't reflect suspected increase in heroin use

Schools that had more repeaters had more suspensions, other signs of trouble in student body

Experts say rise in allergy triggers, summer medication 'breaks' and back-to-school virus exposure may all contribute