why is it if you see somebody yawning , you will do the same?

Answer 1

Perhaps yawning was preserved in our brains from all the way back in ancient times. It may have been desirable for everyone in a tribe of humans (or other animals) to go to sleep at about the same time. That way, perhaps everyone in the tribe would be on the same sleep schedule, ready to take on the challenge of the next morning. Perhaps yawning developed in a tribe of nomads, people who wandered from camp to camp every few days. Getting up, packing, and setting off on a journey would require everyone to be working together at the same time. You wouldn't want any stragglers lagging behind the main group. They might get attacked or they might get just plain lost.

You also wouldn't want a small group to go off on their own ahead of everyone else. They might get attacked, too, being a small number easy for an enemy to overcome. Or they might go off in some direction (the wrong way) the main tribe would rather avoid. If you're going to get lost, better to do it together. Tribes that didn't have this form of communication may have had discord, some arguing, and loss of efficiency. Their competitors, who did communicate this way, may have gotten a slight advantage.

I can imagine that the leader of an ancient tribe might have felt that it was time for everyone to hit the hay. If there was no hay to be found, perhaps he meant it was time to sprawl out on some rocks warmed by the fire, or a mat of pine boughs. So he yawned. Everyone else in the tribe yawned back, letting the leader know that they got the message: Time to put down the net weaving and sleep. Thousands of years after the last ice age, a yawn still sends the signal.

Answer 2

i do not imagine all people rather is conventional with why yawning is "contagious," yet there are a selection of theories on what motives yawning mostly. One became that it released extra CO2 from the body, yet i imagine that one has considering been discounted. presently, a study indicated that yawning easily occurs to sit back the mind. many people were said at the same time as observing video clips of people yawning. some held warmth packs to their heads - those people yawned particularly regularly. Others held chilly packs or breathed with the help of their noses - those people yawned least in many situations with the help of far. this is because respiratory with the help of your nostril or employing a warmth %. has already cooled down the mind. i wager i did not rather answer your question, yet i got here upon that study exciting...

Answer 3

a few good studies of yawns of been done and it does seem that they are contagious . also the first person to yawn is letting someone else be above him