feeling drained

Work was very slow due to the fact it was a "work" day and I have been there for almost a month.  The 2:30 feeling hit me and I could fall asleep in moments if I tried.  After a week of exercises my body is beginning to feel a little different.  My muscles are fatigued but also feel more firm.  I don't notice a difference in the mirror yet but it has only been six workouts.  I am going to try to do the stretch video tomorrow even though it is optional. I don't think I will be waking up at 5:00 to do it though.  P90x is a 90 day cycle but at the end of the 90 days (if I make it)  I will probably want to continue.  We'll see what November holds.