I have slept in a tree when I used to be part of a recreational tree climbing group. They use special equipment though.. a hammock designed for it, and always stay tied into a rope. I also used to be a professional tree surgeon, and occasionally will climb a tree when hunting. If I had the right gear I think I would spend the night in the tree and hunt from there when the sun came up.. that way you would not have to get up so dang early..