Eli5: After losing sleep, why are people more sleepy the day after, rather than the day they lost the sleep?

Question

For example, you only get 4 hours of sleep
Suday night. You are tired on Monday, but it’s not too bad. Monday night, you get your normal 8 hours. But on Tuesday you feel exhausted. Why does that happen?

In: Biology

Answer 1

I don’t think this is the norm tbh id absolutely be tired on the day after no sleep, and feel refreshed the next day after sleeping.