If you're the parent of a preschooler, you've likely struggled with what types of videos and TV shows to allow your child to watch.

A new study published in the journal Pediatrics may help you decide how to shape those viewing habits. The study focused on more than 550 children, 3-5 years of age. Researchers wanted to know whether changing the type of media they watched improved their sleep.

Half of the families were assigned case managers who helped them replace violent or age-inappropriate media with educational age-appropriate content. Parents were also encouraged to watch with their children.

The other half received no media counseling.

Both groups filled out three questionnaires over the course of 18 months. Researchers looked at how long it took the children to fall asleep, the amount of times they woke up during the night, the number of nightmares, degree of difficulty waking up in the morning and daytime sleepiness.

The researchers found that when the children watched what they termed "healthy media" had significantly lower sleep problems. They recommend that parents and teachers consider media choices in the prevention and treatment of a child's sleep problems.