Điện thoại, máy tính bảng và giấc ngủ
Cập nhật: 05:53 21/09/2012 GMT+7
(TNO) - Nếu bạn thường cảm thấy khó ngủ vào ban đêm, lý do có thể là sử dụng điện thoại di động hoặc máy tính bảng nhiều trước khi đi ngủ.
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