This isn't about humans though, but life in general. Mostly everything sleeps, theres been a lot of time for something to evolve that would both be intelligent

This isn't about humans though, but life in general. Mostly everything sleeps, theres been a lot of time for something to evolve that would both be intelligent and not need sleep, and yet there isn't. 5000 years isn't remotely close enough for sleeplessness to evolve, more like a few million. Its not so much why do humans sleep, but why do apes? Why does anything?