I have a tendancy to stay up quite late, usually until 2 or 3 AM, and sometimes even 4AM

(unless I have an early morning lecture) .. so, I'm often sleeping in until 11AM or mid-day. My biological clock seems to wake me up after about 8-9 hours of sleep, so I don't often sleep longer than the 'norm'.
I suppose for me sleeping until around about 2 or 3 in the afternoon would be sleeping in.
Nice to know I'm not alone in my habits.
