According to a new study, teenagers are dealing with learning problems, mood swings, anxiety and depression because they're staying up late to play video games, surf the Internet and send text messages.


The researchers found that teenagers send an average of 34 texts per night after bedtime, these texts occurring from 10 minutes to four hours after going to bed. The average teenager is also awoken once a night by a text.


"These activities are not sleep-promoting, like reading a novel or listening to music. They stimulate the brain and depress normal sleep cycles," said study author Peter Polos.