I'm not really jet lagged

I've been in the UK for almost two weeks now and have this bad habit of going to sleep at about 5 AM. At first I thought it was because my brain was still calibrated to the Pacific Time Zone. But, I've come to terms with the truth of the matter. I'm tired at night, but can't go to sleep because I'd rather be reading, watching television, or meeting new people. I spent the last two years studying practically nothing but medicine. Now that I have license to explore interests outside of the human body and what happens when it is diseased, I have been spending my time devouring anything and everything in my sight that is not medical in nature. It feels good!