Caffeine can seriously affect your sleeping habits. As a stimulant, it increases adrenaline production and blocks hormones that make you feel tired and sleepy. This isn't such as bad thing when you're trying to perk up in the morning, but high amounts of caffeine, especially later in the day, can affect you for hours afterward and seriously harm your sleeping patterns. Caffeine may also throw off your internal clock, meaning your body won't feel like sleeping when it naturally should, based on daylight and your circadian rhythm. Quitting caffeine lets your body reset its internal clock and keeps you from producing too much adrenaline at the wrong times.
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