I posted a message back to you on my journal page instead of directly to you.I like your interesting job and caught your 'yawn'. I have an article from CHEST 2009 and it talks about the correlation to Sleep Apnea and MVD. I was just dx'd with severe sleep apnea with hypoxic events down to 75%.It has been 9 days now after 4 weeks of CPAP and I've not had to use extra nitro spray. I didn't know I had apnea issues.Another member has MVD and she also has apnea with hypoxia.So watch out for those yawns!Researchers think if you have apnea you'll have MVD.Another new area of study.Your pic looks like the beach in SC that I just came off of with a tan!