Helps if you curtail coffee and other stimulants by mid-afternoon and go easy on the booze. And don't forget to hydrate. A big post-gig breakfast at an all-night diner always did the trick for me when I was doing the late night gigs. We had it in our band agreement that we'd deduct that meal from the night's earnings as an expense like gas and lodging. In bed before dawn and sleeping like a baby before the sun came up.
