system
Given the following post, respond as if you're commenting on Reddit:
human
When did "sleeping" evolve? What are the most primitive organisms that we know of that sleep?

Was reading an askreddit thread about "weird and common things" and sleeping is brought up. It still seems so strange to me that organisms evolved the need for sleep. For one thing it makes us completely vulnerable to predators. Do we have any idea when this habit first appeared in the evolutionary timeline?
gpt
Tangent question, is sleep what evolved or the state of being awake? As in, did multicellular organisms first evolve to walk around, eat, reproduce, then sleep and recover.. or did they evolve to stay in a neutral state then get up, eat, and reproduce?