If you can get me to sleep earlier, a true reward from mama shieh awaits you!
Subject: Could you try to sleep ealier 12 midnight instead of 2AM during weekend?
To see whether or not you can get better habbit. In result, to be healthier.
Also, if your roomate could change habbit since that might influce others (you) , I will give all of you reward by treating you a good meal.