system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does a stuffy nose seem to temporarily cure itself when you are excited or alert?
gpt
Adrenaline is released during times of excitement, stress etc. Adrenaline causes your blood vessels to constrict, which frees up space in your nose and allows you to breath. It is the basis for how decongestants work, which are stimulants and have a similar effect.