I was qualified for a $500.000 online tournament which starts in a few days. The tournament starts at 19:00 and blinds go up every 20 minutes so it's a slow tournament. This means that if I'm running well it could go on deep in the night or even the next morning.
Besides having enough sleep before the tournament, what are good tips to stay fit/awake when it gets really late? Food/drinks/things to do?