I will admit, I am very lucky in that regard. Just comparing against the recommended amount of sleep, I get an extra 14 hours a week. And I can actually function quite well on less, but not sustained (and never deliberately try to reach that state, but bouts of insomnia have forced me to learn this).

I do tend to sleep in on the weekends though ("sleep" isn't quite right, more like lazily stay in bed until 0900 or so while drifting in and out).