Why Do We Yawn?

Why Do We Yawn? The Science Behind That Stretchy Reflex

Ever catch yourself yawning during a boring lecture—or even just watching someone else yawn? You’re not alone. Yawning is a universal human experience, but scientists are still uncovering exactly why we do it.

So, what’s the deal with yawns? Let’s break it down:

🧠 A Cool Brain Is a Happy Brain

One leading theory suggests yawning helps regulate brain temperature. Just like how a fan cools a room, a yawn might help cool the brain by drawing in cool air and boosting blood flow to the skull.

➡️ This “thermoregulatory theory” was supported in a study published in the PMC (2013), showing that brain temperature tends to decrease after a yawn.🔗 Read more

😴 Is Yawning About Sleepiness?

Sort of—but not always. We yawn more when we're tired, bored, or just waking up, but not necessarily because we’re lacking oxygen (an old myth). Instead, yawning may help wake the brain up when alertness starts to dip.

😮 Why Are Yawns Contagious?

That’s the weirdest part. Seeing, hearing, or even thinking about yawning can trigger your own.

Researchers think contagious yawning is tied to social bonding and empathy—the stronger your connection with someone, the more likely you’ll yawn when they do.

➡️ PBS explored this with neuroscientist Andrew Gallup, who explained that contagious yawning may be linked to mirror neurons—brain cells that make us mimic what others do.🔗 Check it out

🩺 For Nursing Students: Why This Matters

Understanding reflexes like yawning can help demystify neurological function, patient behavior, and emotional cues in care settings. It’s a small thing—but it reveals a lot about the human body and brain!

So next time you yawn, remember—it’s not just about being tired. It’s your brain’s way of cooling off, staying alert, and maybe even connecting with someone nearby.

“This material is for informational purposes only and is based on guidelines from The Canadian Red Cross, Alberta Heart & Stroke Foundation, and Alberta Health Services. This content does not replace professional medical advice or official safety training. Consult your physician or safety training facility for further guidance.”