It’s a fairly well known fact that some people aren’t known for making the greatest decisions when they are fatigued, exhausted, sad, excessively happy, or angry. There’s something about it that impairs good decision making skills at times. You find yourself doing things that you would never do if you were calm,collected, and rational. It’s happened to the best of us. I have a theory that there are certain people that we only find attractive when we are exhausted or in some type of vulnerable state. It’s not that these people are necessarily bad, but in more ideal circumstances they would never receive a second glance. 
I remember someone once saying that you should never make an important decision when you’re upset, sad, or angry because oftentimes those are the decisions that are regretted the most. In the same way, I think that it’s also good to be self aware of the signs that indicate we are really tired or fatigued.

Maybe that way we’ll be able to avoid some bad decisions.