In my first life I woke up 5 min before the alarm clock aroun d 5.30 AM.
When I was a student, I worked in nightshifts as much as a half time job starting 10 PM to 6 AM. During that time I developed my two turns day: Go to bed at 7 AM, get up between 10-11 AM, do the day stuff, take a second brake between 7 and 9 PM, get up and go to work.
I did this for nearly 5 years: 3 days night shift then back to the normal schedule - 3-4 times a month. Talk about Jetlag? Not for me! But the price for that was: My daily rythm isn`t worth the word anymore.
Now I have a normal job. I have to be there between 6 and 9 AM and roughly work 8-9 hours a day.
I would love to start early and get up around 5 AM like I did in my former life, but for that I would need to go to bed at around 10PM the day before - impossible for me: I just love the evening/night - The sound on the radio, the TV programs - all much better!!
I normally head for the bed around 1AM now and get up around 6.30-7AM - but its just a compromise.