Sometimes in my life, I'll have times where I'll think everything is going ok, good, or perhaps even well. It's at these times that it's all the more startling when I suddenly feel "wrong". And not just wrong, but wrong for such a long time. Wrong in a "Why didn't I see this before?" way. Now, (or more accurately about an hour and a half ago) is one of those times.
Our lives are balancing acts. Nothing is purely black or white. A reasonable approach is to weight all characteristics, and make a call based on the totals. A less reasonable approach is to look only at the positives, or only at the negatives.
This less reasonable approach can be taken because of lack of sleep, or other reasons.