tired?

I am in the home stretch.  5 more days  till surgery will have been on opti for 3 weeks.  For the past couple days  I have been so so tired.  Is it normal to be tired since I have been on it so for long?

I was I. It for two weeks.  I found near the end I was tired too

I was so tired I could barely lift my feet ..especially the days I was working. 

I have been on for 2 weeks and like I said I have surgery Friday.  I only started being tired in the last cpl days.. good to know its normal :-)