Scientists Don’t Yet Know Why We Yawn
We yawn when we wake up from sleep. We yawn when we are tired. Sometimes, we also yawn when we see other people yawning. While yawning is a big part of our life activity, scientists don’t understand why we do it. Some scientists believe we yawn to cool our brains and keep them from clotting.
Another reason suggests that our bodies cause us to yawn when we need to wake up. The motion from yawning also helps to stretch the lungs and their tissues. However, scientists are yet to figure out exactly why we do it.