system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do I sweat heavily and wake up feeling awful after a daytime nap but when I sleep at night this doesn't happen at all?
gpt
Probably has to do with light. Light makes your brain wake up, and prevents it from entering any of the deeper, more restful stages of sleep. Basically, because the sun is up (high light levels), your brain wants you to be up and prevents it from sleeping, and also doesn't turn down any processes in the body. Heat production, as a result of digestion and such, never turn down like they do sleeping at night in a deeper stage of sleep. This is so the body is ready to go at a moment's notice, because you should be awake during the hours of light.