A new study has found a correlation between the amount of TV kids get before bed and their lack of sleep.

Researchers from the University of Auckland surveyed over 2,000 children on how they spend their last 90 minutes before bed, and they found that watching TV dominated activities. In fact, it accounted for 30 minutes of the 90-minute period.

Researchers found that those who went to bed later watched around 15 minutes more of TV each night.

Dr. Jyoti Krishna, a sleep expert with the Cleveland Clinic, urges parents to create environments that invite sleep by limiting physical activity and using low-level lighting.