I have never been an early riser, but I know a lot of people are. They get up at 5~6 in the morning, every morning. I don't particularly have a desire to get into this habit, but have always thought that I can do it if I want to except that I cannot imagine how somebody can do nightlife on a regular basis once they are settled into this pattern. So, I need to get some perspectives from actual early risers. Do you do nightlife? Let's say you hang out with friends or go out and don't go to bed until 1~2 AM for multiple days in a week, how can you not be exhausted?