There's more evidence that watching violent or age-inappropriate images on TV, in movies or on computers can significantly disrupt children's sleep.

Kids age 3 to 5 who were exposed only to age-appropriate viewing materials in the hour before bed were 64 percent less likely to have any type of sleep disturbance, such as trouble falling asleep, difficulty staying asleep or nightmares, according to a new study.

Perhaps surprisingly, "violent" media might even include popular kids' fare such as SpongeBob SquarePants, said the study's lead author, Michelle Garrison.

"Making a relatively simple change in what kids are watching is a change worth the effort," said Garrison, a principal investigator at the Center for Child Health, Behavior and Development at Seattle Children's Research Institute. "Sometimes parents feel overwhelmed by the idea of getting rid of TV altogether, but switching shows can make a big difference."

The study will be published in Pediatrics journal. 

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