I try to power through but in the last three tournaments, I find it a struggle to keep awake. And two or three times I have fallen asleep. I have no tolerance for those kind of delays.

I will try to go to bed an hour earlier but that's difficult. However, if I find myself drifting in the morning I think the best remedy would be to give up the game I'm in and let the tournament continue while I lie down with a 5-minute alarm on and get a really quick catnap. That 5 minute sleep should push me through without a problem.