I'm in this same club..
I get a crappy dull foggy headache that sets in on opening my eyes in the morning, and lasts till I go to sleep.
Much worse in the mornings though. But I can bear it for the rest of the day. :-/
Every now and then I get a miracle day.. I only wish I could predict when it would happen.
The only time I seem guaranteed to be without one is when I've been intubated or just knocked out for a procedure on oxygen..
Which has happened twice in the past 2 weeks - lucky me
I'm very suspect of "groupings" of events being a cause, especially closer to wake-up time.. probably some of this is paranoia, but my groupings sometimes look very scary.
A scary example of my data in the new User Guide for S/H.. (was 4 days after appendix surgery, so a little dope might have been an issue..)
http://sourceforge.net/apps/mediawiki/s ... sers_Guide