The exact causes of contagious yawning are still debated, but two leading hypotheses are the nonconscious mimicry hypothesis and the empathic modeling hypothesis. These theories suggest that ...

For the past few years I have been prone to intermittent bouts of yawning lasting for several minutes. They can come on at any time – out walking ... proposed that the stretching of the arms ...

When you wake up in the morning, do you choose to do that curled-fist stretch you always yawn through ― or is it kind of involuntary? If you don’t feel in control of the satisfying movement ...

For example, in a study of parrots, researchers found that these birds' yawning and stretching behaviors occurred in synchrony, supporting the idea that such behaviors may promote social cohesion ...