What do scientists mean when they say “we don’t know why we need to sleep”?

Question

I see this a lot but isn’t the basic answer just that the brain needs to recharge and clean out toxins within the body?

In: 1

Answer 1

The pineal gland regulates circadian rhythm and much more.. If you look into the bodies processes (also the brain I’m using body as one whole system) you may gain more insight on this.