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许多人认为，晚上喝咖啡会导致自己睡不着，其实最新研究指出，咖啡因对睡眠影响不大，反而睡前喝酒及抽烟，将导致较难入眠！

佛罗里达大西洋大学和哈佛大学针对785人进行14年研究，检测咖啡因、酒精和尼古丁的用量，并透过手腕上的感应器与睡眠日记，得到受试者的睡眠持续时间、睡眠效率及醒来的速度等数据进行比较。

研究结果显示，对经常失眠者而言，睡前抽菸让他们需要花42分钟才能入眠，而越接近睡觉时间饮酒对受试者睡眠影响越大，至于咖啡因造成的影响则非常小。

即便每个人的睡眠记录可能有偏误，但研究人员对自己的研究结果相当有自信。上述论点也有其他专家曾提出过。