Overall I must say when I don't get enough sleep my attention span is horrible, it's like all the sound around me goes out, and all I see is lips moving when people talk. I lose one of my senses at the moment lol.
I am emotionally sensitive when sleepy as well, I would take things a little more personally, and I'm kinda quick to throw the nice attitude back to the person that started it.
Also I can't be super hangry for too long I will turn into a monster lol.
Lastly, I tune out what is going on around me and the most random things start going through my head old memories, funny tv scenes and etc.
To say the least I'm a huge mess when I am sleepy