Playing a video game before bedtime has only a mild effect on adolescent sleep

After playing "Call of Duty 4" it took adolescents a median of 7.5 minutes to fall asleep, which was only slightly longer than the three minutes it took them to fall asleep after watching "March of the Penguins" on DVD. No participants fell asleep while playing the video game, while about one-third of them fell asleep while watching the DVD. Playing the video game was associated with a small increase in cognitive alertness.

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