Like everybody else after on stand or in a blind for awhile, we all get the zzzz feeling. I think its just normal. There's video's with all the top hunters you see on t.v. they also sometimes snooze on watch.
That's why most of them hunt in the morning....comes back to camp....and goes back out fot the late
afternoon. During the peek of the rut...its always nice to stay longer. (if you can)
If you can't...and a big buck goes by your stand when your at camp....lol....that's what you call hunting.
Do like I do....try to find a ridge with a runway below edging a swamp, lake, river..ect. This way you don't need a treestand. You can just sit on a chair, lean against the tree, look below and dream a little.
Like my Father use to say....when you sleep, you don't move or make noise.