system
Given the following post, respond as if you're commenting on Reddit:
human
What’s the difference between sleep and just laying down/resting?

Why is sleep required for our bodies, and what does it do that simply laying down and resting doesn’t do?
gpt
Frankly, nobody knows for sure. It's one of the great unresolved questions in psychology and neurology. Hypotheses for the function of sleeping range from consolidating new memories to cleaning up metabolic waste products accrued in the brain. All we know that deprivation of sleep eventually incapacitates you no matter how much physical rest you get. Or, like some researcher once quipped, the only thing we know for sure is that we sleep because we get sleepy.