Nên tránh xa thiết bị điện tử 1 giờ trước khi ngủ
Các cuộc thăm dò do Quỹ giấc ngủ quốc gia Mỹ thực hiện cho thấy khoảng 95% người Mỹ sử dụng thiết bị điện tử trong vòng một giờ trước khi ngủ. Năm 2013, quỹ này phát hiện rằng 89% người trưởng thành...
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