i train my sleep patterns for about a month before gun season (I usually hunt the evenings for bow) by getting up a 4 am and either working out, or preparing my hunting gear/watching hunting shows. I also chew coffee beans while on stand to stay alert. I also find that glassing through binoculars frequently keeps me more alert. Finally, if absolutely necessary, I'll lay down in a dried out ravine behind my stand and nap. Its very well protected visually and on private land, so I'm not worried about hunters or deer seeing me or shooting me.