What they all said. It's the predator in you. I can't imagine hunting without getting the fever LOL. BUT, you also want to make a good shot, and shaking like Don Knotts ain't the best thing either.

Something I did years ago when new to bowhunting, which it's critical to have a steady shot, is to see myself making the shot. Not simply taking the shot at the animal, but the whole hunt. Getting into my stand, having a look around, and sometime later, seeing the deer. Seeing the deer come closer and closer until the moment of truth. Drawing back on him, releasing the arrow, seeing it hit, the deers reaction and ends with me recovering him. I know that sounds a bit out of whack, but it lets one replay the scenario over and over in their brain. I do it constantly while in stand to this day, picking different situations each time. Not only does it help, but it keeps your mind actively thinking about the hunt. I does work. I guess you could say it calms you psychologically because in your mind, you've done it so many times. In fact, many pro athletes use the very same tactics.

But in the end, that rush of adrenaline is what its all about. It reminds you of your place in the natural world.