system
Given the following post, respond as if you're commenting on Reddit:
human
Do we really need to 'catch up' on sleep, or will a simple 8 sleep cover it?
gpt
It's called sleep debt, and no, simply sleeping for eight hours the next day won't immediately "reset" your body. Your body accumulates fatigue when it misses out on rest, and it can take a couple weeks of regular sleeping before the effects of sleep deprivation are mitigated.

As for why this happens: the concept of sleep debt is pretty well agreed upon even if the mechanisms of it are not well understood.