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

Is that a thing?

If i miss sleep one night and catch up the day after I’m fine

If i miss sleep multiple days in a row i start to feel exhausted

Everyone is different though and sleep varies massively from person to person