I recently had a home sleep study and the results came back showing that my saturation fell below 88% for over 100 minutes. But no apnea episodes. I sleep on my stomach so I didn’t expect to have typical apnea. I do have severe asthma and wake up often at night. But the severe desaturation vas a surprise. I am supposed to go back to do a split night test but I bought a pulse oximeter and am yet to reproduce the desaturation. Is it possible to have a false positive sleep study hypoxemia result?