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Curling up in bed with your tablet or e-book reader may sound like a cozy way to unwind at the end the day, but it could actually keep you from getting a good night's sleep.

A new study finds that using light-emitting electronic devices such as iPads and e-readers with illuminated screens in the hours before bedtime makes it harder to fall asleep and get the deep sleep you need to feel rested the next morning.
سید حامد واحدی سید حامد واحدی     3 دي 1393