Becca,

I am not at all surprised that you slept for hours after PT. At first I literally passed out like I was comatose. One day after a grueling PT session I slept for 5 hours straight, woke up for 2 and then slept through the night. An experience nearly identical to yours. My take is the brain is re-setting itself.

My PM doctor espoused intense workouts. My sessions are one hour in a warm salt water pool. I feel like I have been drugged afterward, however I recover in a few days and notice little improvements every time. I hope this will be true for you, too.

Good luck! I am rooting for you.