Sleep isn't "wasted" time. Without sleep, we'd be dysfunctional, and soon thereafter, dead.

I'd pay for the opposite: more time to sleep, since I never have enough ;)

That is an individual effort. Reducing one's sleep can be done. There are processes to do it. You have to make your subconscious more efficient at processing. During sleep your mind makes subconscious connections and processes events of the day. By practicing different forms of meditation it can allow your mind to do that.