SLEEP APNEA...I could not use a CPAP. My dentist attended a seminar on OASYS nasal airway system (http://www.oasyssleep.com/), an FDA approved oral appliance for those suffering from OSA , recommended it to me. I have been using it 2 years. I have a massage chair that has zero gravity position(the most relaxed position) & when I'm on that position as a I sleep, I snore loud. But with the OASYS mouthpiece & I barely snore at all. In my experience, this mouthpiece is an alternative to CPAP.