Maurice experienced extreme fatigue when he first went on Tarceva. He was unable to get out of bed until about 4pm each day. After about 2 - 3 months of this it dawned on me that he was pretty good from about 4pm to 8pm each day and that seemed to be his strongest time of the day & so we asked the onc if he could take the tarceva at night & sleep through the worst of the fatigue. It has made a difference. Most days he gets up at a reasonable time ( 8am ) and is fine until about 11am when he goes & takes a nap for an hour or so, then gets up until about 3pm and takes another nap.
Tarceva has to be taken on an empty stomach so we set a small alarm clock for 11pm and that's when he takes it.
He also needed a shower stool during that time but doesn't need one now. Good luck with Dad, I hope this helps
wendyr