Over the years I have hunted many an all nighter,It seems that mornings and evenings are the most productive.Some may disagree but there seems to be a lol in activity in the middle of the night,I suppose there bellies are full and they need a nap much like we fill after a big meal.But I agree with Woody you just have to get out and hunt hard and maybe take notes and after a while you can see some patterns developing.Good Luck.