Dear Robyn,
You probably are, but on the other hand, you are very, very lucky that he will lay there and rest. That rest is important to the peace of the whole home and family for sure. I read in a child development book that children need afternoon 'nap' or rest time until they are 5 or 6. Probably after coming home from K. they should rest for a bit, if only watching a good tv show or playing quietly on their bed.
I have a theory that not enough rest time during the day causes children to get into misbehavior patterns because, as you said, they are toddler crabby, and it turns into a way of getting through the day. Also, moms need day time rest too. This is the hardest part of your life, with lots of important responsibilities. Actually you are like a General in the Army, and your actions and attitudes influence the whole family very deeply.
My son was very active and I felt that when he watched tv, that he was really resting at the same time. He didn't watch it much, just when something really interesting to him was on.
Good Luck, C. N.