This makes complete sense. The different sleep levels we experience have all kinds of restorative functions for the body and brain. If Apnea prevents the deeper levels of sleep, it follows that memory would be impacted as well as other mental and physical functions. Our body is a miraculous system that is dependent on all manner of things like nutrition, environment, sleep, activity, stimulation, affection, to name a few.
I only got diagnosed just this year, because I was on a retreat and my colleagues heard me stop breathing. I thought I was tired cause of age, too many jobs and being a single mom of a teen. Turns out, I had moderate sleep apnea. I find my brain is much clearer, I'm less confused and can remember more. Here I thought I was in the early stage of Alzheimer's.