Even when I have to be up at 6:15 for work I find it difficult to ever get to bed as early as 1:00. I usually go to bed around 2:00 on work nights and often later on weekends or vacations. During the summer I get really horrible about it! I'm like some of you--I love the peacefulness of the wee hours and often think clearer then. Last summer I found myself getting to bed later and later, until I was going to bed after sunrise. Today was my last day of work for 2 weeks, so I'm sure I'll have at least a few late nights (beyond 2:00). However, I have a cold so may want to get a little more sleep.
P.S. On the rare occasion that I have had to get up super early (like to leave on a trip) I have really loved the early morning, watching the sun come up and the world begin to wake up.