Why do yawn? A new researched . It found that yawning is . We yawn when we see yawn. We yawn when we try to stop yawning. Some want to yawn more than people. Reading about yawning could make yawn. You might want to yawn right .
The researchers studied the and brain of 36 people. They looked at of other people . They had to yawn stop yawning. The people were videoed doing this. Jackson said understanding more about yawning will help to treat . He wants to find to help the .