There were a few different studies in this article but the first one sounds like an entire night of no sleep. I’m not very observant when missing that much sleep so their conclusion (that we’re mean when we miss a whole night) matches my own self.

The second two studies were more interesting with a very modest amount of sleep loss but also showed a very modest effect.

What I’m most interested in sleep loss is in performance management. How grumpy we are is one thing but I can easily lose a whole day of work if I miss a few hours a few nights in a row. I would love to see more data on this.