First of all, let's analyze the benefits of sleeping in the lower berth. I think it's more convenient to sleep in the lower bunk, because it's quick to get down to the bed and toilet without climbing stairs, and there is enough space for our classmates to put things under the lower bunk. But sleeping in the lower bunk is actually harmful, that is, sleeping in the lower bunk is not so private. Basically, every roommate will pass by your bed when passing by the dormitory, which has a great impact on your daily rest.
Then let's analyze the benefits of sleeping on the upper bunk. Sleeping on the upper bunk means you can have your own private space, because you have to climb the stairs to get into bed, and the height is high. Usually, your roommate's daily walk will not affect your work and rest. For people with shallow sleep, the upper bunk is a better choice, but it is not particularly convenient to climb up and down every day. Getting things up and down is actually a waste of time, and sometimes it will be a certain degree to accidentally step on the ladder.
Therefore, everyone must choose according to their actual situation. In order to facilitate daily work and rest, I suggest you choose the lower berth. If it is for better privacy, you can choose the upper bunk. Of course, students who sleep in the lower bunk can also have privacy, that is, draw a mosquito net curtain on the bed.