There is a moment, right before the first sip of coffee hits, where a human being is operating on pure animal instinct. We cannot reason and we have no social skills. Just narrowed eyes and a low rumble that loosely translates to "do not speak to me yet."
Scientists call it being tired. The rest of us call it being a werewolf.
The legends say that under a full moon, a perfectly normal person transforms into something feral, unpredictable, and completely impossible to reason with. But you do not need a full moon for that. You just need a Tuesday morning before the kettle has boiled. The growling is the same. The territorial behavior is identical. The complete refusal to engage with civilization? Absolutely lupine.