I actually know the perspective this question is stemming from. Presumably from the angle of how one look when one wake up in the morning. I agreed, it could be so scary to look into the mirror first thing in the morning knowing one's face is unkept. But this would have been an issue for me if I usually go to bed without taking care of face, which I do always.
Notwithstanding, I would not still have qualms looking at the mirror in the morning because however my face looks, it can't possibly get me the bearer horrified regardless of how bad it is. Morever there is nothing there if one get to behold the flaws in one's body including the face.
Honestly, I have come to appreciate every part of my body no matter what other people thinks. And so, if I wake up in the morning and I look at the mirror and see something unpleasant on it, I will quickly wash it of before having encounter with my neighbors.
Therefore, there is nothing wrong in looking at the mirror first thing the in morning because, it will enable one to tell how one face looks so that he/she can do the needful in taking of it.