Caffeine is a central nervous system stimulant. It works by stimulating the brain.It is used for restoring mental alertness or wakefulness if you are experiencing fatigue or drowsiness.The main ingredient in coffee that gives us that jolt is caffeine, a central nervous system stimulant. Caffeine is found naturally in coffee beans, tea leaves, and chocolate, and is a popular added ingredient in carbonated beverages and some over-the-counter medications.
Ironically what should be keeping you awake is making you feel tired.One reason could be a possible allergic re-action or alternatively if you are adding large quantities of white sugar it cause spikes in blood sugar levels which in turn causes insulin(hormone
) to be dumped in your system which could be leaving you tired later.
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