Very helpful site!  I would like to suggest the addition of a very helpful and fun link to your list.  Dr. Robert Sack, Medical Director of the Sleep Disorders Medicine program at Oregon Health Sciences University is writing a series on sleep for Open Spaces Magazine.  Two essays from that series - one is on sleep apnea and the other includes sleep apnea among other sleep problems - are available online for free at www.open-spaces.com under "online articles."  Dr. Sack provides very helpful information in a pleasant, conversational tone. 
LM

Hi. After twenty years of poor sleep I have solved the problem.  I bought a waterbed, and my sleep is now restful.  If I wake in the night I get back to sleep easily, and I have no more stiff necks!   Hooray. 
Best Wishes,
John