Do you take naps?

I work 6-3. Try as I might, it's difficult to get to bed before 11:30. As often as I can, which is usually at least three days a week, I catch a nap from 4-6 - sometimes not the whole 2 hours, and sometimes I go until 7. My wife gets home at 6 and she doesn't want wake me. On the weekend, I sleep in until I feel like getting up.