Yawning is a mostly involuntary process of opening the mouth, breathing in deeply, and filling the lungs with air. While there’s no precise cause of yawning, it’s often viewed as a natural ...

You know the feeling. It’s getting close to bedtime, you get sleepy, and you start yawning automatically. You may even find ...

Think of a cartoon character starting their day with a hyperbolically large yawn, complete with outstretched arms and a gaping mouth. State change isn’t the only known cause though. Research ...