Bạn đang học với tư cách khách.
Đăng nhập để xây dựng thói quen.
Bài đọc · ~168 từ
AMany adults report lying awake for longer than they would like, and smartphones are often blamed. Health surveys consistently show that a large share of people check their phones within the final hour before sleep, scrolling through messages, news, or social media.
BResearchers have long suspected that the blue light from screens suppresses melatonin, the hormone that signals the body it is time to rest. Beyond the light itself, scrolling through engaging content keeps the mind alert exactly when it should be slowing down.
CRecent studies complicate this simple picture. Several trials found that screen light alone has only a modest effect on sleep quality, and that stress, caffeine, and irregular bedtimes often matter more than the glow of a phone screen in a dark room.
DSleep specialists therefore avoid blaming phones alone. Their practical advice focuses on habits: leaving the phone outside the bedroom, choosing a calming activity before bed, and sleeping at a consistent time, regardless of how much blue light a device happens to produce.