I have sleep apnea diagnosed when i had a overnight stay at a sleep center. The results were i had NO REM sleep,a case they never saw before. it was so hard to fall asleep for so long, but i was given the sleep apnea breathing machine which also helped greatly in sleeping. I think i agree that memory loss is caused sometimes by a not so good sleep schedule and also i did sleep in the day alot instead of the nighttime, which was also reversed with the machine. Good luck i hope you can get a sleep study done somehow