Long before I ever knew anything about sleep apnea,let alone that I had it, I always noticed that if I could remember dreaming, I felt as if I had had a good night's sleep. When I could remember my dreams, it felt as if I had enough sleep that night. Usually, I did not remember my dreams, so the difference was quite noticeable to me.
Just my 2cents
Resmed Vpap Adapt SV Enhanced, Respironics Fit Life total face mask, Forma full face mask.
Complex apnea, original AHI 80