What is the purpose of yawning and Why we yawn more while there is a cool breeze?
I know little, that the yawning is for getting more oxygen. But I doubt why yawning is necessary and when there is a cool breeze or during sunset, we have more yawn than the rest of the day. Even when we feel drowsy, we start yawn, what is the relationship between sleep and yawn.Kindly answer.
Actually, the idea that people yawn to get more oxygen has been discredited in recent years. There has been a lot of research on this, and a number of theories have been tested. Some studies suggest that yawning may cool the brain slightly, allowing a clearer thought process - this may be why we yawn when bored or stressed.
The best-supported theory connects to yawning in the evening and when we are tired, and it has to do with the fact that yawns are contagious as well. Researchers believe that a yawn may be a social signal for a group behavior - when one member of the group gets tired and begins to yawn, others in the group start to yawn as well, and it helps their bodies synchronize to get ready to sleep at the same time. This has obvious advantages for groups that include youngsters - the parents can only sleep soundly when the babies are sleeping as well, so keeping sleep cycles in sync is very important from an evolutionary standpoint.
Most mammals exhibit yawning behaviors similar to humans, so that tends to support these theories as well.