FAS, I'm not even getting to sleep, jus lying there wide awake 'till 3 or 4am. Like you I notice it more after the hard sessions/midweek races, although it always happens to some degree if I run/bike in the evenings, not noticed it happening after morning sessions though.
If i'm running/biking 3 or 4 times a week in the evening, after a couple of weeks i'm shattered.
Free Radical, What's the secret then?