Good information here for those who have difficulty getting to sleep – at night, or when taking naps. Excerpt:
The popular military method, which was first reported by Sharon Ackerman, comes from a book titled “Relax and Win: Championship Performance.”
According to Ackerman, the U.S. Navy Pre-Flight School created a routine to help pilots fall asleep in 2 minutes or less. It took pilots about six weeks of practice, but it worked — even after drinking coffee and with gunfire noises in the background.
This practice is said to even work for people who need to sleep sitting up!
The military method
Relax your entire face, including the muscles inside your mouth.
Drop your shoulders to release the tension and let your hands drop to the side of your body.
Exhale, relaxing your chest.
Relax your legs, thighs, and calves.
Clear your mind for 10 seconds by imagining a relaxing scene.
If this doesn’t work, try saying the words “don’t think” over and over for 10 seconds.
Within 10 seconds, you should fall asleep!
Read more, including other methods, at https://www.healthline.com/health/healthy-sleep/fall-asleep-fast