I have seen one interview of a former gambler and what he is saying caught my attention. He says that "when you're winning you can't sleep". I'm not sure if others have experience it or if this make sense. In any case though, one explanation is that we are really in a heightened alert.
It’s hard to settle down when you’re winning, and when you have won, even if you did not take drinks that will energize you, the dopamine will get you excited all night.
I experienced that myself because I seldom win, and it’s an exciting experience that lingers on all through the night, and because of the excitement of what you’re going to do with your winning.
Some winnings make you awake the whole night, and some winnings will make it hard for you to sleep for a few days.