The caffeine found in coffee, tea, and even chocolate is a stimulant that can keep you up longer than you planned. How much caffeine your body can handle depends on you, but a good rule of thumb is to put that cup of joe down a few hours before bed. The same goes for alcohol. Drinking a glass of vino too close to bedtime — or drinking two or three — will prevent you from having a restful night of sleep (even if you pass out fast).
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