If not requiring a lot of sleep has an advantage in our society (which presumably it does) then all else being equal, a non-sleeper will produce more offspring. This is just evolution 101.
Just about the only advantage you need to reproduce these days is a willingness to do so.
That's only true for women. And it doesn't mean that there aren't still evolutionary incentives for women. If they are successful because they don't need to sleep, they can probably find a better mate (which will lead to an evolutionary advantage of the no-sleep gene long term).
Assuming that societal advantage results in more offspring. Do the rich have more kids than the poor? I'm not sure that they do.