Both my father and brother in law have sleep apnea and have to sleep with oxygen masks on their faces. My SO tells me he thinks I have it as well so I'm looking into it...
I do not have this problem myself, but my dad does. He also had to sleep with an oxygen mask for a while, but now has it under control enough that he does not need the mask anymore.
I was diagnosed with mild sleep apnea and was prescribed a CPAP machine, but cannot tolerate it possibly due to a deviated septum and now I have to see a sleep specialist.