Your results are typical. OSA events can kick you out of deep sleep or REM. So now that your OSA events are being addressed with CPAP, your titration doesn't look any better for deep sleep (Stage 3 &4).
So what did your sleep doctor say about that?
If you are like most, absolutely NOTHING or they brush it under the rug as being "insignificant". Guess what is most likely keeping you from getting Deep Sleep?
My guess is those 70 per hour PLM's. Probably every time you go to get into Deep sleep, one of those leg kicks bounce you out of it so you are back to Stage 1/2 or REM, anyplace but Deep Sleep.
My suggestion:
Research magnesium, calcium and melatonin. Hopefully, the magnesium will settle down the neuro kicks, melatonin put will you into deeper sleep than you are getting now. If you don't read any, read at least the 2 top links:
Some links for you to read:
http://www.umm.edu/altmed/ConsSupplemen ... nincs.html
http://www.mayoclinic.org/news2003-rst/1937.html
Some of the data contained in this webpage appears to have come from the early data I have also read, the importance of it shows how our melatonin levels peak throughout the day:
http://www.ceri.com/melaton.htm
So if you have a normal day/night sleep schedule, our natural melatonin levels peak at about 2AM and decline until morning when you wake up. So if you are taking medication which impacts your normal ability to produce melatonin (and many do), what may happen to your ability to sleep?
And lastly,
compare the adverse side effects of melatonin to any other prescription drug's side effects such as Ambien or Lunesta.
Here are some others:
http://www.sciencedaily.com/releases/20 ... 113832.htm
http://www.nimh.nih.gov/press/sad-melatonin.cfm
http://www.pubmedcentral.nih.gov/articl ... id=1407707
http://www.xagena.it/news/medicinenews_ ... 9bcbc.html
While we all don't traverse through our sleep Stages as shown in the graph above, if you did, and are not getting any deep sleep where will you land or spend most of your time? You can also see why you spend more time in REM as the early morning hours approach. Granted we all get less deep and REM as we get older, but you are not old enough yet to get zero. It won't be easy, but work on reducing those leg movements. If you can settle those down you may get some Deep Sleep and possibly feel some restorative effects from sleep.
That chart came out of one of my medical books, don't think it was green eggs and ham, but if that chart is even remotely accurate, if you don't get into deep sleep from sleep onset you will get less as the night progresses even if you are "Normal". That graph represents what Normal would/should be.
Confine your research into getting more deep sleep, in order to do that you have to reduce those PLM related arousals (your doctors are not going to do it for you).
someday science will catch up to what I'm saying...