What happens to your body when you give up caffeine

You'll sleep better

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Caffeine helps you fight off the sleepies, of course, but it can work too well, providing not just a clean break from sleep when you need to be awake but preventing sleep when you actually want to be sleeping. Drinking too much, especially late in the day, can wreak major havoc on your sleep patterns. Its affects can be felt as long as six hours later — meaning a cup of coffee to get you through the last hour of work at 5:15 could be the reason why you're laying in bed, wide awake, at 11:15.