It is also used for reflexes such as yawning, coughing and sneezing. He was often seen yawning loudly and sleeping in court. Higgins's tricks included yawning and sneezing on cue. He begins with Chaos, a yawning nothingness. This is why swallowing or yawning is successful in equalizing middle ear pressure. Dogs demonstrate contagious yawning when exposed to human yawning. "Pandiculation" is the act of yawning and stretching simultaneously. Evidence for the occurrence of contagious yawning linked to empathy is rare outside of primates. Contagious yawning is one means of evaluating such disorders. A similar hypothesis has been used to explain the cause of contagious yawning. However, in general the gap between political aspirations and practical reality is still yawning. This indicates that contagious yawning may have evolved several times in different lineages. I feel all gassy inside from yawning. This supports the claim that contagious yawning is related to empathic capacity. Two classes of yawning have been observed among primates.