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Trying to get a good night's sleep? Put the phone away!

VANCOUVER (NEWS1130) – Stop answering work texts before bed!

US researchers are warning it could lead to burnout and a messed-up sleep schedule.

Two Michigan State University business school studies have found that using a smartphone for 20 to 30 minutes after 9 p.m. makes it more difficult to detach from work and relax enough to get a good night’s sleep.

The result could be the inability to concentrate on the job the next day.

Researchers also found smartphone use in the bedroom interferes with sleep because the bright light simulates daylight; it inhibits the production of the sleep-promoting hormone melatonin.

Brazil has passed a law requiring employers to pay for smartphone overtime. Last year, the German employment ministry banned its managers from calling or emailing staff outside of working hours except in emergencies.