Have you tried to sleep with earplugs on? Do you still wke up tired then? Also, I think the environment can have a much deeper impact on our health than most doctors like to admit. You could also wake up feeling tired as a result of changes in air quality (chemicals, mold, spores, wall paint, even furniture materials apparently).

Here's an interesting collection of reads:

http://readpiles.com/pile/Environmental-Illnesses,-Chemical-...