I work overnight shifts (11pm-7am) and take caffeine pills to stay awake. When I get home, even if I take more caffeine I’m sometimes still too tired and fall asleep. Why does it eventually stop working? Is there some sort of chemical limit? Why can’t caffeine replace sleep for longer periods of time (like days on end)?
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Caffine blocks the chemical signal that makes you feel sleepy. This also can make it more difficult to purposefully falling asleep. It doesnt stop your body from saying “Hey! Ive had enough from you tonight, young man, you get your ass to bed right now. “
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