Eli5: what happens to our body when we “look” tired? Why our eyes and face slightly change?

Question

Eli5: what happens to our body when we “look” tired? Why our eyes and face slightly change?

In: Biology

Answer 1

The muscles in your body are fatigued, including the ones in your face. It takes energy to appear alert and reactive in your face. When you’re tired, the muscles in your face are moving slower, or not at all. Humans are really good at noticing patterns and cues in someone’s face. So even really small things can make a face appear tired.