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Caffeine: How much is too much?

You don't get enough sleep

Caffeine can keep you from sleeping. Even small amounts of sleep loss can add up. The loss can keep you from being alert the next day.

Using caffeine to make up for your lack of sleep can be a problem. For instance, you may use caffeine to help keep you awake during the day. But the caffeine keeps you from falling asleep at night. So you get less sleep, which makes you more tired the next day.