Probably that, yea.
It just makes me so angry.
I tend to have a very strict routine and clean workplace setup to avoid mistakes, and in my last shift I almost threw away not one but three processed samples because I was so tired that I couldn't focus that well.
Luckily, it was only almost because I usually double and triple check after every step that I didn't do a mistake.
Sleep deprivation and exhaustion will get to people, and it will not be pretty.