I'm like you Susan. I've been working shifts for 20-something years now, and having started an office job a couple of months ago I am absolutely loving the sleep patterns! Mind you, I've totally lost the ability to sleep in on my days off, which is probably a good thing when you think about it.
I love sleep, but sometimes it eludes me, especially when I'm writing. I've been known to skip a day or two, or survive on a small power-nap for one or two days at a time. It always comes back, and wipes me out for most of the day when it does.