Some people seem to have luck by taking 100mg vitamin B1 before sleep for central apnea:
https://www.cpaptalk.com/viewtopic/t176555/Found-a-vitamin-t...
Given B1 seems to be working similarly to acetazolamide but appears to be much safer, I am wondering if anyone is using it for altitude sickness? Doping up a few grams of thiamine just before climbing?