SLEEP IS SACRED!!!!! It definitely has a negative effect when you don't get it, both on how much you eat and what you choose to eat. (Vanderbilt prof just released a study proving it). Between that and the stresses of exams/projects/papers, are the reason I always naturally lost weight during breaks while I was in college (I worked full time as a Hairdresser to put myself through Architectural College full time). Be as good to yourself as you can.
Regarding BMR. Numbers are determined by statistics, and variables exist. I agree with Pebbles, start with about 10% below your BMR+activity, see if you are comfy there and then hone in on the macros. I think the idea of not eating under your BMR is important for nutrients, it is how much over that you need to eat to feel good and still lose weight that is the conundrum.
The equation in which you take your goal weight in kg, and figure out your macros from that has, for many of us, comes crazy close to BMR equation. Did you try that one and see what it says?
In the end, each body is unique, and it will tell you what it needs. Unfortunately, I at least, have lost touch with the cues and so I have to do these equations to get back to where I can listen to it.