Do you snore? Do you have sleep apnea? Don't forget you have been through a lot and it takes a long time to recover. Is it possible that when you exercise you're over doing it a little? After my step-father went through his treatments for prostate cancer he was always tired and the doctors found that he was lacking iron...one little iron pill a day makes a world of a difference for him.

good luck and keep us posted

7-16-08 age 37@Dx, T3N0M0 SCC 4.778cm tumor, left side of oral tongue, non smoker, casual drinker, I am the 4th in my family to have H&N cancer
8-13-08 left neck dissection and 40% of tongue removed, submandibular salivary gland & 14 nodes clean, no chemo, IMRTx35
11-4-08 Recovering & feeling better