Pehaps it is just an introverted thing then? :mellow:^ Maybe. I've worked overnights for about ten years and I'm neither of the above types (close ... but no cigar). The middle of the night during the summer is my favorite. I can go outside (at the job) and sit on the patio for a while and just think.
Interesting, but I personally don't think that most people could maintain it for very long. Two hours' worth of sleep per night isn't enough even for me - and I typically sleep far less than most people do.