I hunt alone about 95% of the time and I almost always over do it. I'm super excited and I hike too fast, too far, too long. The mental fortitude starts to crack around day 5 of hunting hard from dark to dark. Days 5-7 I'm not hunting smart any more. I'm dragging myself along, pushing through fatigue, disappointment, and a growing knot in my stomach that my tag might go unfilled. On the last day or two of the hunt I am so tired and not having fun any more, and I end up quitting early. When I was successful on a hunt it was nearly always in the first 4 days because I was mentally still in the game. On the later days I am physically out there, but mentally I am not. I've blown many good opportunities on animals. I take shortcuts and am too loud, move when I shouldn't, don't honor the wind/thermals, or don't take my time when making shots.
The one exception I can think of was in 2013 when I went on a 10-day archery WT hunt. I had patterned a monster buck and hunted him conservatively. I paced myself. I took naps. I even took a few hours here or there to go on a low-intensity small game hunt to get my mind off the big target. In the last hour of shooting on day 10 I got within 15 yards of that big bruiser with my recurve. I could not contain my exhilaration and sailed my arrow a few inches over his back. I still count it a success to get right where I wanted to be, despite not sealing the deal.
My goal this year is to pace myself, take breaks, hunt smart, slow down, and be OK with not hunting every legal minute of shooting time.