same here, first thing in the morning just in case I can't do it later on; don't sleep home often, but it depends; really doesn't matter upon waking going all the way to before bed.
I know I told this story here, but still I remember one time heading to a destination on that was an afternoon flight arriving the next morning; I dosed up at an airport restaurant and was kindly awaken by one of the stewardesses with morning wood like whoa.