system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can I stay awake all night and feel pretty good the next day, but if I sleep for one or two hours I feel like shit?
gpt
In basic terms, when you go to sleep, your body sort of shuts down. If you don't sleep an adequate amount, your body has difficulty getting started again after you wake up. If you don't sleep at all, then you don't have the issue of having to get your body going again.