Yes, the fatigue can be just as much a problem as the pain. I read awhile back that we fibros should rest and hour and a half every day. Sometimes you just can't do that.
Yesterday I had to get up at 6AM after having trouble going to sleep the night before. It hit me this morning when I couldn't get out of bed until 11AM.
You know, the sleep and pain are inter-related. Not enough sleep means more pain, and pain can interfere with sleep.
Both mean memory problems.