How sleep works: what pulls you to bed, and what your brain does all night
Caffeine: what coffee really does to your sleepiness
A friend drinks his third coffee at midnight and says he feels fine. Five hours later, he is asleep on the table. What does coffee really do to your sleepiness?
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1
Monday, 3 pm, and you want a coffee. Remember the cells that keep you awake: adenosine settles into their receptors and slows them down, and you feel it as sleepiness.
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2
Part of caffeine looks a lot like adenosine. To a receptor, that is enough: the two fit the same dock.
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