why do tears come out when you yawn
When you see someone yawn, you might yawn too and something else may also happen. You might shed a tear or two. When we yawn, the facial muscles surrounding our eyes pull tight. This may put pressure on our
(the glands that are neatly tucked away deep beneath our upper eyelids just below our eyebrow bones. ) These glands produce the watery component to our eyes' own natural tears. They are working to produce and release tears slowly throughout the day to coat the surface of our eyes at all times, not just when we cry (think about it, that is why our eyes always look so glossy. ) When the facial muscles tighten during a yawn, causing them to release a small amount of tears that they were storing to release later.
So the next time you let out a big yawn (hopefully it didn't happen already while reading this), pay attention to the muscles around your eyes to feel them tighten and then make note whether or not you get a little teary eyed. It's not sad, it's just science. Yawning is the body's way of acquiring extra O2 to keep us going when tired or just plain bored, so why does it also make my eyes water and then my nose run? i. e.
What causes the lachrymal glands get involved at all?! This is due to the cathartic effect caused by body's sympathetic mechanism which operates on the principle of expulsion of excess fluids by excitement, thereby restoring order and balance, harmony and health in the body. If the body needs more oxygen it just takes a deeper breath. Something else is going on when we yawn.
My favorite theory is it has evolutionary origins when it was a good idea to bare your teeth to the people around you before going to sleep to stop any funny business. I've been doing some 'observation' and reckon that big yawns may simply cause the eyes and the tear ducts to get scrunched up so that the extra pressure squeezes out the tears - and this then makes the nose run too. (Blinking rapidly also produces tears). I also like the catharsis theory, it could well be a part of what is happening. Sniff.
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