A recent study in Finland determined that cert ain kinds of TV viewing caused sleeping disturbances in children. Although all television viewing had some effect on sleeping, the following kinds of viewing disturbed sleep patterns the most in children: watching adult targeted programs, such as current affairs programs, police series, and movies; watching TV alone; watching TV at bedtime (especially caused sleep-wake transition disorders and daytime somnolence); and high levels of passive TV exposure when adult programs were airing. Children sleep better and are more rested when they view less television. Just another great reason to turn off the tube.
http://www.sciencedaily.com/releases/2006/06/060601214412.htm