can you not just wake up later?

I wish. I get up with my wife, which is normally around get stuffed.

I guess the good thing about that is that we both have some solid built in "alone time" hours

Yeah, this is how I have used it. But with the same breath, I think it is detrimental also.

And I don't know how much you would like/approve of the technology that would be required to make that app possible XD

Very little. But can you imagine what habits most people would adjust with it?