I am trying to decide if I should follow up. Last year, it was discovered that upon sleep, my oxygen level would sink to as low as 60 percent. I was sent for a sleep study, where while it was discovered I had sleep apnea, it was mild and there were additional episodes where my percentages sank and I was not experiencing apnea. Outside of being placed on oxygen at night, nothing more was said; no referrals, nothing. Now I am experiencing other things that I don t know if are related or not but want either more extensive testing or at least an explanation for why my levels are so low.