Now that is kind of funny. I'm the exact opposite. I am most always fine leaving the house in the morning, just enjoying being outside and riding to work. In the evening, I can be really uptight from work, and by the time I get home, I'm fine.

This is a really interesting thread. It's amazing how many different reasons people give for enjoying commuting by bike. There also seems to be a common negative feeling of some sort when you don't ride on your commute.