Why I don't sleep much.
I work in Web Design in an office based in Shrewsbury. The days are your average 9am - 5pm (with an extra 30 minutes tacked on for some reason). Now, Shrewsbury is about an hours drive from my house, with another 15 minutes walk to the nearest free parking. This means that in order to get to work on time the latest I can leave my house is 7:45, which means in order to get up, get dressed, have breakfast and make lunch I need to be out of bed by 7:10.
In the evenings after work I will get back home at around 6:45pm - 7pm. I will then need to have dinner, wash up afterwards, spend some time with the wife etc. I usually get time to myself from 9 or 10pm. So basically, if I was to turn in at midnight, I only get 2 or 3 hours to myself for gaming or mapping or browsing the net. Basically, it's not enough.
So I don't sleep, and at weekends I sleep even less to make the most of my time off. Usually turning it at 4am Saturday morning and getting up at 6am, then turning in again at 4am Sunday morning and sleeping until 9 or 10.