I really think sleep is the on/off of the human psyche. If we posit that we regularly need “updates” and upgrades in our deepest emotional recesses, sleep is where it happens. There will come a time when people do not remember this, but I remember when the first thing tech support asked you to do when your computer crashed was turn it on and off.
If you want to grow, if you want to prosper, sometimes you need long, languorous, outwardly useless sleep. You need it sometimes in large quantities, especially in the winter. We need to be more like animals, because in large measure we still are. Animals don’t live by clocks outside their bodies.