system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why cant we develop pills or other medication that can replace sleep?

What about sleep is difficult to replicate? What functions does sleeping have that we aren't able to recreate?
gpt
The most obvious problem with this is that there's still a ton we don't know about sleep. How it works and why it's needed. There has been and will continue to be a lot of studies on sleep, but we're still a long way from fully understanding it.