Mg or melatonin have 0 effects on me, Mg helps if I over-exercise but thats for muscles regeneration.

I dont have problems normally, just cant sleep in high altitude, 3000m is already showing mild effects. Guess what, I do/did quite a bit of mountaineering, its easy to get above 5000m in himalayas, highest I've been in tent attempting to sleep before summit push was 6000m on Aconcagua. Tried both Mg and melatonin up there over multiple nights, 0 improvements. I had highest O2 blood level measured in 5500m by doctor (mandatory there) from whole group.

Physical effort makes better sleep for literally everybody, thats age old knowledge and I havent met a single exception yet.

> Mg or melatonin have 0 effects on me

> I dont have problems normally

A lot of things don't have effects on people that don't have the problems the thing is trying to solve.

I wonder if that is an adaptation time problem? It takes about a month for the body to fully adjust. I live at 1500m elevation in the Denver area of Colorado, but I do recall feeling more restless during sleep at elevation before I lived here.