During my radiation treatment I had to sleep sitting up because if I lied down I could not breath at all. My RO then made me take a week off, because the swelling in my throat was so bad It could not even lie down for treatment without struggling to breathe. Yes, sleeping was an issue for me and has been since. Now it is not due to pain, but to dry mouth. Anyway keep fighting. Just remember about 4 weeks after treatments end you will start to feel better. Pray that the treatments worked for you.