Which is all well and good unless you can’t fall asleep in the first place with what feels like a vacuum cleaner in reverse attached to your head...
If you have severe enough SA to need one of these machines you’ll fall asleep fine, because you’ll actually be able to breath. SA is a nasty thing, people going years without real restful sleep. I’m one of those really sensitive sleepers, but I know if I’m tired enough I can fall asleep eventually.