New research reveals that pre-bed television watching interferes with a child's sleep.

Researchers surveyed the parents of about 600 preschool-age children, from 3-5 years old. Children who were allowed to watch violent TV during the day increased sleep problems, and watching TV after 7pm was linked to sleep problems, regardless of whether or not the programs contained violent.

The researches advise that doctor ask parents to limit late-night TV and media, and violent programs in general, for young kids. Be mindful of children's programming because some shows are more suitable for seven or eight years old, not preschool children, the researchers said.

Kids with TVs in their room watched more TV and were more likely to have sleep problems; also the more TV children watched, and the more violence they were exposed to on TV, the more problems they had sleeping.

The study, published in the journal Pediatrics, adds to the growing body of research that finds children who watch violent TV, or even too much TV during the day, may struggle with bedtime and nap time schedules.