I know I should be ashamed of myself, but the only way I can stay up all night is when I’m sitting at my computer. I can’t learn Torah all night and not sleep. It just doesn’t go. I can’t focus on really difficult things at that hour.
So generally on Shavuos I just go to sleep a little later than on a normal shabbos or yom tov, like around midnight instead of around 11.
And yes, I know it sounds weak, but that’s just who I am.