Because of the thin oxygen at high altitude, many people have trouble going to sleep.
Why, you ask?
Because we breathe automatically at night; no thought is required.
The problem is that the body cannot get enough oxygen using that automaticity.
It was always my weakness when backpacking and mountain climbing. I simply could not fall into a restful sleep, even when bone-tired.
The highest I’ve ever climbed was 14,495 feet.
Yes I found out the hard way about needing oxygen. It ruined my art workshop. My heart pounded even during the day. It was like someone was jerking the sleeve of my shirt 24 hours a day. I am a low land gal, the mountains are beautiful but no more.
I have been on many hunting trips to New Mexico, Colorado, Wyoming but for some reason the altitude gets to me now. Could it be my advancing age? LOL!