Thanks for all of the replies. My doc has checked for anemia, all clear on that one. We have checked my lung function, good there too. I have been on b.p. meds since my daughter was born, which was in 1996. I'm wondering if the b.p. med, which works by slowing the heart rate, combined with the sleep apnea is what's doing it. I just thought that maybe someone had experienced that as well and it just isn't reported as a symptom yet, KWIM? I haven't started treating it yet, I just had the first sleep study. Doc has also checked my kidneys & liver function. The results from the thyroid study should be in this afternoon. So far everything else has checked out fine, I'm an otherwise healthy person. It just might be anxiety from not knowing exactly what's going on. I've never felt this lousy before in my life! I do think I'm lucky that my doc thought of checking for sleep apnea at such an early stage. I've been reading a lot on this board, and one thing I notice is the comments from folks that went years feeling this way without being diagnosed correctly. For that I am thankful!