To Sleep in a Battlefield

Method used by pilots/military in WW2 during battle, took most of them 6 weeks of practice to fall asleep within 120 seconds.

1. Get in a comfortable position.

2. Slowly relax your face, shoulders, arms, legs, etc. one by one.

3. Clear your mind or/by hold(ing) a serene thought for 10 seconds.

For example: fantasize that it is a warm spring day and you are lying in the bottom of a canoe on a very serene lake. You are looking up at a blue sky with lazy, floating clouds. Do not allow any other thought to creep in. Just concentrate on this picture and keep foreign thoughts out, particularly thoughts with any movement or motion involved. Hold this picture and enjoy it for 10 seconds.