It may be linked to a sleeping position, but I'd bet not on poor oxigenation, but on obstructed blood stream that makes it hard to spread that chemical that tur

It may be linked to a sleeping position, but I'd bet not on poor oxigenation, but on obstructed blood stream that makes it hard to spread that chemical that turns sleep paralysis off. I do not remember details of phisiology of sleep paralysis, what is the paralysing chemical, and which one is stopping it, and where from they come, but it seems plausible that sometimes a sleeping position can make it hard for chemicals to reach muscles and free them from paralysis.