system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we heal quicker over a night's sleep than awake?
gpt
When you sleep, you're lying in one position pretty much motionless for 5-9 hours.  Your body is using very little energy on your muscles or other activities, so it can devote itself to healing.  And with no motion, there's no risk of further aggravating your injuries.

Theoretically you would get the same healing effect if you spent eight hours lying in bed awake watching TV.  But you would really have to stay *in bed* for all that time - no getting up to get a drink, or go to the bathroom, or anything.