How valid is an elevated morning heart rate as an indicator of overtraining. Wouldn't waking up to an alarm clock cause a slight stress response anyway which could elevate heart rate?
Not sure about the alarm clock (although mine scares the crap out of me most mornings), but I think another (and possibly better??) guage is your body temp. Just get a cheap digital thermo at the grocery store and take your temp as soon as you wake up, while still lying in bed.
In the military, we are in a constant state of overtraining. I sometimes feel really groggy (but thats nothin a little ephedrine couldn't fix!!), I will always feel tired and burnt out. My resting heart rate (when not on ephedrine) is unusually fast. Hope that helps. Just remember to take a few days off every now and then. RLTW
-When in doubt, flip it to burst.