Caffeine will get you going during the day but could leave you tossing and turning at night — unless you are a “night owl” to begin with, a new study suggests.
In the study, “morning people” who consumed caffeine during the day appeared more likely than late risers to awaken in the middle of their nighttime sleep.
Fifty college students were asked to record their caffeine consumption and their sleeping and waking times for a week.
Photo: Reuters
照片:路透
As college students, they tended to be so sleep-deprived that, for most, “it didn’t matter how much caffeine they had” — they slept well whenever they finally hit the sack, said study researcher Jamie Zeitzer.
However, for the early risers, the more caffeine in their bodies, the more time they spent awake during the night after initially falling asleep. This was not seen in the night owls.
(Liberty Times)
Photo: AFP
照片:法新社
一項新研究顯示,咖啡因會讓你在白天蓄勢待發,但夜裡輾轉難眠,除非你一開始就是夜貓子。
在這份研究中,早起鳥白天攝取咖啡因,夜裡睡覺時似乎比較可能比晚起的人容易醒來。
五十名大學生被要求記錄咖啡因攝取量與睡眠以及醒來的時間,持續一週。
研究人員傑米‧札其爾說,由於大學生睡眠容易被剝奪,「不管攝取多少咖啡因」,他們入睡時都會睡得很好。
不過對早起鳥來說,血液裡較多咖啡因,晚間初次入睡後醒來的時間較多,在夜貓族裡看不到這種情況。
(自由時報/翻譯:自由時報國際新聞中心)
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