Upper airway resistance can cause CFS. Look at these symptoms. Do they look familiar? http://web.mac.com/sypark/iWeb/West Side ENT/UARS.html and another link on the subject: http://www.endfatigue.com/health_articles_r-s/Sleep-uars.html A few years ago, I did a sleep study and found out I have this condition. However, the specialist told me it could not explain my whole CFS profile. I would like to find out if other members have the same thing.