@johnhans my sleep medicine doctor wants my AHI number to be under 4 also. I've been using my CPAP for going on 4 months now and have been under 4 five or six nights so far but it keeps going up a few notches when I have a good night. My last 4 nights have been 4, 3.3, 6.9 and 6.5. It seems like it's related to not sleeping on my side as much but not sure.