It’s not uncommon for us to be cranky when tired.
I am prone to being cranky when I’m already exhausted by college assignments. Staring at my PC for hours, having absolutely no idea what I was doing or writing and also hoping that my GPA wouldn’t disappoint me.
I’d also be cranky when there’s a group assignment, but one of the member — I’m not talking about myself — disappears or doing his part of the task sloppily. It’s because it eventually will affect the outcome of my GPA. At least, I expect them to be easily contacted.
I’ll also be cranky when sick. But fortunately, I’m seldom getting sick.