ive heard stories of buddhist monks sleeping while sitting with spoons in their hands. they sit with crossed legs, and the very moment they fall asleep, their spoon is dropped and the sound of it hitting the floor awakens them. supposedly, they can go for a really long time doing this. and ive seen a tv program showing the same guys drying their cold, wet clothes by laying the cloth over their bodys and raising their body temp thru concentration. u could actually see steam coming off their bodies.