Why does caffeine make me sleep better?

Question

I have self-administered around ``4 mg/kg`` of caffeine (peroral), and around two hours later I fell asleep, being just a little bit sleep-deprived. After around five hours of sleep I found myself awake, in awesome mood and I did not want to sleep at all. It was not a one-time thing, I did notice it before, but this is the first time it really caught my attention. What is even happening here? P. S. Plase notice I drink a lot of coffee, so there might or might not be a slight tolerance. I do not have any sleep-related health issues. I have zero education in subject areas. Also, excuse me for my English.

Answer 1

Caffeine blocks adenosine receptors in your brain. Adenosine is the chemical that makes you sleepy. As a result caffeine SHOULD keep you from being fatigued, so I'm not sure in this case. However, coffee can give you a sugar crash or make you slightly dehydrated, both of which can cause you to feel drowsy. Additionally, because adenosine is blocked from its receptor, it accumulates, and so when the caffeine wears off you receive a nice dose of it.