Preteens who use a mobile phone or watch TV in the dark an hour before bed are at risk of not getting enough sleep compared to those who use these devices in a lit room or do not use them at all before bedtime.
Preteens who use a mobile phone or watch TV in the dark an hour before bed are at risk of not getting enough sleep compared to those who use these devices in a lit room or do not use them at all before bedtime.