Sometimes when I for example drink coffee, I still feel exhausted and just fall asleep?
In: Chemistry
Simplified…..think of locks and keys. A chemical (key) bonds to a receptor (lock) that makes you sleepy. Caffeine prevents this key from binding to the lock. There are only so many locks and keys and eventually the effects wear off and you get sleepy. Your body wants to sleep when it’s tired and of the locks are still recovering the caffeine won’t block the key. Your body can build a tolerance to caffeine and you have to drink stronger coffees to have the same effect. Less is more!
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