Don't know but on the flip side some of these so called "big fights" are great for trying to get to sleep. Recently whenever I have trouble falling asleep (I have bad insominia) I just put on the Pac Clottey fight and all of sudden ..bam out like a light. It's great .
Fights are in the evening so they'll got to bed and get rest whetehr they sleep or not, adn they have all mornign and afternoon the day of the fight to sleep. They probably nap loads and eat in bed and stuff. Though some will be so happy and confident in the work they've done that they'll sleep like a baby. Some are porbably so happy with it they can't sleep cause they just cant wait to get in there.
Vicodin. Lots of vicodin. But chances are, if you've chosen "pro boxer" as your profession, the pain doesn't bother you so much.
if they have trained hard enough they will still fall asleep but i remember when i was amatuer i would wake up a couple times in the night and have naps etc