I thought since when we sleep, our airways expand a lot, so maybe it's ready to expand?
Or doesn't it stretch your throat (in a good way)?
I dont know lmfao :P
Yawning is interpreted to have a variety of meanings, ranging from tiredness to boredom. Perhaps more interesting is the fact that yawning is contagious among humans, at least: watching someone else yawn, seeing a photograph or reading about -- and even the mere thought of -- yawning is enough to induce this behavior in observers. (Tell me: have you yawned yet?) Even though yawning is very common, the physiological and evolutionary reasons for yawning behavior are poorly understood:
Take care !!
I read in some scientific journal that in the waking and exhaustion cases, it's the result of a small lacking of oxygen to the heart, and your body trying to compensate.
Cause when you yawn it gets more oxygen to your brain, so you can wake up a little :]
my boyfriend told me that!
I agree with the oxygen to the brain and all to increase energy.