For work and for study can be the main reasons why people tend to get up quite early in the morning. For one thing, those people who want big money certainly would get up early and start their own business or their regular work. They have to do it. For another, ordinary students who are extremely busy with everyday study need to do so mainly because they are under higher pressure, the opportunity of a top university you know, which is hard to get. By the way, some seniors who can't sleep well might be getting up so early, it is natural problem you know. So I think that here are the reasons. That is it.