Attention DUmmie rockhead: lots of people don't need that much sleep. Left to my own devices, in an "ideal" sleeping situation (quiet, cool room, dark, etc.) I will seldom sleep more than about five hours, and then I'm completely ready to go for the day.
If Trump feels that he needs more sleep, I'm quite certain that he would have no qualms whatsoever about adjusting whatever he needed to in order to get more sleep.