system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does having a window down when you're nauseous help keep you from vomiting?

Or just cool air in general. Like when you're on an airplane and you feel sick it kinda helps to have the air blow directly in your face. Why does this help?
gpt
So, one of the reasons we get motion sick is because the brain cannot rationalize the movement of a car with our bodies movement. Basically, we're moving, but the brain can't figure out why because we are not physically moving. This sort of disorientation in our equilibrium is attributed to poison or toxin by our brain, forcing us to expel our stomach contents to rid us of the poison. Taking away the closed off and immobile atmosphere inside a car is a good way to relieve motion sickness because it tricks the brain into thinking its true movement. 

Also it helps relieve the symptoms leading up to vomiting. Sweating and dizziness can be alleviated by cool air.