I take a nap about every other day XD Most of the time it's completely unintentional. I'll be sitting in bed and then lie down because my back hurts, then I end up dozing off. I always wake up thinking, "wtf happened and what time is it?"
Maybe a few years ago? I'm not really sure, but I know it wasn't recently, because I can't fall asleep when it's light out. Unless I got absolutely no sleep and I am under the blankets. =) Unfortunately, I can't take naps because I can't fall asleep when it's light out.