I've always loved sunrise and I've long loved 1am to 4am, but I'm no longer allowed to be a night owl. For about a year I slept, if at all, between 5am and noon, utilizing the quiet nighttime to "compose." Now that I'm not doing that anymore I need to get back into the habit of getting up at 5:30am. Low angled light paired with quiet is just a beautiful thing, mornings are really hard to beat.
Whenever I think of sleep or lack of, I'm reminded of the movie "cashback." Great film, very funny. cheers, j