Hi itsbackagain, what you are describing is a very common reaction after a therapy session, especially one in which you have been honest. I remember coming home after therapy and sleep for hours on end. As if my system could not handle all the emotions and shut itself down. Than, in the days to come, I would let the emotions back in in small chewable quantities. Often once we get into therpapy, we let all of the suppressed emotion come out. You bet that is a LOT to handle, since the body is equipped to protect itself from overflow, you might feel extreme exhaustion and fall asleep. It is hard to be in therapy and not fun, but definitely worth it. Sound like you have a good therapist though. You want one that makes you feel like ****, you want one that is compassionate but is not afraid to get you into your discomfort zone. I believe, but that is personal, unless we are faced with our demons (that reside in the spaces we avoid looking at, since it brings out painful feelings), we can not heal. Try to accept your feelings and be gentle with yourself and admit to yourself what you need, then give it to yourself and be okay with that.
Good luck.