Hi Tracy, a lot of people get hit in the afternoon and need a nap, it's quite normal and it doesn't stuff up your body clock at all. You know the term Siesta in spanish is little sleep because everybody would nap in the afternoon.

I know people that have to have a lie down in the afternoon to help recharge their batteries for later. They're find morning, but flat in the afternoon.

You shouldn't feel guilty about that at all. It's just the way some people are, they need it.