10 Surprising Facts About Caffeine [2 of 10]

2 of 10 It Starts Working in Just Minutes
 
According to the American Academy of Sleep Medicine, it takes about 30 to 60 minutes for caffeine to reach its peak level in the blood (one study found increased alertness can begin in as few as 10 minutes). The body typically eliminates half of the drug in three to five hours, and the remainder can linger for eight to 14 hours. Some people, particularly those who don’t regularly consume caffeine, are more sensitive to the effects than others.

Sleep experts often recommend abstaining from caffeine at least eight hours before bedtime to avoid wakefulness at night.

 
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