Hi, I have had sleep apnea for about 8 years and could not tolerate CPAP. I ve been trying an Oral System Balance device while sleeping and have been experimenting with various sleep positions (side, back) and head of bed elevations to assess impact on sleep apnea. Do you know of any studies done with sleep apnea, sleep positions, and elevation of head of bed? I am 61, 5 0 , 133 lbs.