Why sleep?

The last time i checked, scientists were still debating the question of why we sleep – what's the adaptive value, benefit, need or purpose of it?

I think all this debate is pointless, because the point of sleeping couldn't be more obvious: We sleep so that we can wake up.

But if we did reach a consensus on this, somebody would be sure to ask: What's the point of waking? Perhaps it takes an insomniac to ask that question … but again, the answer is obvious.

We need long periods of active wakefulness in order to sleep more soundly.