The longer a teenager spends using electronic devices such as tablets and smartphones, the worse their sleep will be, a study of nearly 10,000 16- to 19-year-olds suggests.
More than two hours of screen time after school was strongly linked to both delayed and shorter sleep.
Almost all the teens from Norway said they used the devices shortly before going to bed.
Many said they often got less than five hours sleep a night, BMJ Open reports. Full article
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