If you do a search here on the boards for "chemo brain" (what posters started calling it) it is a pretty well documented experience among many of the posters here. No one has suggested that it persists after the end of treatment, and the body's return to normal without the chemo drugs in it.

Radiation definitely causes people to become very lethargic. I slept 12-15 hours a day during my treatments. I wouldn't be concerned about that, as in my opinion, it is time for your body to recuperate from the onslaught, and it was that many hours that I wasn't in physical or emotional pain. I also wasn't making everyone around me nuts with my bitching about all that was happening to me.....

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.