Kochanski points out in his video about clothing, sleeping bags and sleep that one important priority often overlooked, especially in cold weather is to build a comfortable bed (for exemple, a bough bed that is soft and level, elevated from the ground). In fact he says asking yourself how am I going to sleep is the first thing to do, then you can start looking for water. Sleep is crucial for your mind to stay clear and rational and also to conserve energy so you spend energy that will contribute to save it.

Frankie