Because in this case, the bed is more convenient and humanized. Imagine that in high school, because of the shortage of school resources, we often slept and got up without desks. On the one hand, it is not conducive to learning. On the other hand, there are many people and the natural living environment is complex, so it is more difficult to find our bosom friends. Moreover, in this complex environment, it is easy to make conflicts. For example, the upper berth is shaking, and your lower berth is covered with dust. It is easy for two people to quarrel over this matter.

After going to college, we are all adults, and our living environment should be relatively independent, because people's personalities have become more independent. First, sleep on the lower berth. You will not be affected by the independent environment. In fact, under the influence of other roommates, there will never be a situation where the upper bunk can't sleep because of the movement. We all have our own little space. Climb up to have a rest when you are tired, and climb down to study when you have a rest.

The second reason is that many universities now sleep for four people, especially in some southern cities. For example, our school is a dormitory for four people, but there is no dormitory for six people. In the case of sleeping four people, because a room is not too big, it would be just right if everyone went to bed and served. This can make full use of the environment, and the layout of the whole dormitory is particularly reasonable. If everyone is, get on and off the bed, and then, at the side table, it will be particularly rigid. Imagine that you push open the bedroom door and suddenly find a row of people sitting in rows, sharing fruit. Isn't it a little embarrassing? Therefore, due to the realistic conditions, the number of residents and the reasonable layout, many university beds are under the table.