Sleep Efficiency Studies & Medical Marijuana

Have any CPAP users, with Obstructive Sleep Apnea, explored the use of Cannabis for the purpose of improving sleep efficiency?

Background:
I am a 53 year old male. I was diagnosed with Obstructive Sleep Apnea six years ago and I have used my CPAP consistently since the original diagnosis. On a recent follow-up test, it was determined that my "Sleep Efficiency" was still very low. Specifically, the amount of Slow Wave Sleep (SWS) or deep sleep I was getting was still limited and consistent with untreated sleep apnea. My "Sleep" Doctor suggested that my current sleep architecture had been engrained due to a prolonged period prior to treating it with CPAP. In an effort to re-establish optimal sleep patterns or "re-train my brain", he prescribed Zopiclone for 60 days. I have finished the 60 days and will be re-tested June 17th.

I have always been very active in sports and exercise; my diet is very good; I consume a very limited quantity of alcohol, and I am diligent in maintaing a healthy lifestyle.
I have, however; experienced symptoms of: fatigue, sore joints and muscles, poor memory, poor cognitive ability, and depression. My annual check-up and blood work have indicated that my cholesterol is too high, and my testosterone levels are too low. All of these symptoms are consistent with untreated sleep apnea.

My research has led me to investigate alternatives to improving my sleep efficiency, and it was during this investigation that I came upon medical articles suggesting that the studies indicate the use of cannibaloids improve the SWS phase of sleep. I have used marijuana recreationally in the past and subsequently experienced what I can only describe as a more refreshing sleep. My mood and level of alertness the next day were markedly enhanced. My use has been infrequent

Questions:
Has anyone else had any experiences with Cannabis that confirms or refutes my personal "findings"?
If you are diagnosed with Obstructive Sleep Apnea and you have had success using Cannabis, is there any distinction between the benefits of Sativa or Indica?

While you are waiting on replies about the medical mj I'll throw some questions out that jumped out at me when reading your post.

How certain are you that your treatment is indeed therapeutic? Ineffective or sub-par treatment would leave one still experiencing symptoms of untreated OSA.

You mention joint and muscle pain. What things have been ruled out that can cause these symptoms? For me, I had been tested for a variety of things before finding out it was due to Periodic Limb Movement Disorder (PLMD) and nothing short of resolving those was going to give me the restorative sleep I needed. Just suggesting that whatever means you use to gain more sleep, try to be sure that it does not mask a condition that needs treatment. If I had sedated myself (as was suggested by multiple doctors) so I could sleep through the limb movements, I still would have had painful joints and muscles. The better sleep would have helped some of my symptoms, but not this one. Now, if your pain sensitivity is heightened due solely to the connection between poor sleep and pain, fixing the sleep could help.

I am all for doing whatever it takes to get the sleep needed for our health and well being. I'm just wary of shortcuts not preceded by due diligence in discovery. Good luck in finding what works for you.