Robyn
                    
                    
                    
                    
                    
                    
                    
                        
                        
                        I was diagnosed with Chronic OSA 5 months ago, my  blood/oxygen level was below 40% while asleep, with  hypopneas lasting over 1 minute, many times per night.  I am now on VPAP therapy (17/8), but have found in the  last few weeks that the old tired and lethargic feeling during  the afternoon has come back.  My doctor is not too concerned,  but I feel as though something's wrong.  Has anyone else experienced  this?