@chai2,
I love my sleep - generally sleep like I've been clubbed.
A few times a year I'll have a night where I fall down sideways across the bed around 9 and sleep til 6.
I find when I go on vacation, I go to bed earlier and get up earlier every day til I'm asleep at 9 and waking up between 3 and 4 a.m. That's not practical for me in the long run.