If you’re in need of a good night’s sleep, it might be wise to give your smartphone a rest from time to time.

New research suggests that the light from smartphones, especially before bedtime, may affect how long and well you sleep.

During the month-long study, participants used their cellphones an average of 38 hours — nearly 4 minutes each hour. And the more screen-time people spent with their phones, the poorer and shorter their sleep, particularly if they used their smartphones near bedtime, the researchers said.

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