Constant yawning may not mean you are bored or tired.
A new study suggests yawning is just the body’s way of cooling down its’ overheating brain.
Researchers in Arizona showed pictures of people yawning to random pedestrians in winter, and in summer.
They found half of the participants yawned in winter while only a quarter yawned in the summer.
Researchers believe it is because the brain-cooling effect only works when the air outside is cold.