17. Yawning Releases Dopamine
Dopamine is the hormone in your brain that helps you to feel relaxed. It is a neurotransmitter that helps control how you move, how you feel, and how well you remember things. Yawning actually stimulates your brain to release dopamine, which helps explain why yawns make you feel good.
This is one good reason to encourage you to try not to stop a yawn. Dopamine is essential for your overall health, and low levels of dopamine are associated with things from depression to bipolar disorder to ADHD, even schizophrenia! Dopamine is one of the pleasure hormones that make different activities feel good.