Why do people yawn when someone yawns in front?
Why do people in a group starts yawning simultaneously if someone in group yawns?
Why do we yawn? Why do we yawn? Why do we yawn? What is the reason? Why do we yawn when we're sleepy? Why do we yawn when we are sleepy? Why do we yawn after sleep? Why do we yawn when we feel sleepy? Why do I yawn when I get excited? Why do you yawn in your sleep? What is the purpose of yawning? What is the mechanism that causes people to yawn when they are bored? Can you yawn while sleeping? I yawn a lot at night, what could be the reason? Why do we yawn when we're bored? Why do I almost always yawn after an orgasm? Why does yawning make your singing/speaking voice so good? Why do you yawn when you are tired? Why is whistling contagious, like a yawn? What does it mean when your dog yawns after you yawn? Is a fake yawn also contagious? Why do mammals yawn and stretch? Is it possible to yawn while asleep? Why does yawning increase your heart rate so much? Why does my throat hurt when I yawn? Why do I yawn when I was bored? What does it mean when a dog yawns and isn't tired? Which is the biological purpose of a yawn? Why do some people speak and cry in their dreams? Why do people get sleepy after having cried? Can someone yawn or sneeze while he is asleep?