Heh. I have this. My average daily schedule is 11:30 am (awakening) to around 2:30 - 4 AM (bedtime). No amount of going to bed earlier, cutting out caffeine, vitamin B12, melatonin, warm milk, chamomile tea, exercise, dietary changes, etc. has done anything for it. I've been like this since I was 12, at least (which is when I got my first alarm clock for my birthday and finally realized that, even though my parents put me to bed at 8:30 pm on school nights, I wasn't falling asleep before 1 or 2 am).