Caffeine impacts everything from sleep quality to concentration and heart rate. Learn how long withdrawal takes, the diuretic effects on the body, and the potential risks of taking caffeine tablets with medication or alcohol.
As a nervous system stimulant, caffeine in coffee, soft drinks and chocolate can make you feel as if someone pressed a "fast-forward" button on your body. While caffeine has many effects, one that is not common is causing you to feel drowsy.
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Caffeine is considered a stimulant, meaning it causes a reaction in your body that can speed up your central nervous system, making you feel more awake and alert.
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