There is an Indiegogo campaign for a high-altitude sleep mask. Claims to relieve periodic breathing at high altitude and help with oxygenation. Seems like a good idea:
https://www.indiegogo.com/projects/alti ... dventure#/
It is currently Sun May 26, 2024 6:28 am
Total posts 558011 • Total topics 55843 • Total members 136550