If your child seems to be waking up earlier than ever before, you could blame Dora the Explorer.
A new study from the MassGeneral Hospital for Children and Harvard School of Public Health in Cambridge, Mass., found for every hour of TV a child watches, they lose seven minutes of sleep at night.
The study followed more than 1,800 children from six months old until they were nearly eight years old and found a "small but consistent association between increased television viewing and shorter sleep duration," the researchers said in a press release.
Children who had a television in their bedroom got, on average, 30 minutes less sleep per day.
The study appears in the May issue of Pediatrics.
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