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Researchers have used MRIs to examine the location of tumors or blockages in the brain, but questions still remain as to how those might disrupt pathways that lead to yawning.
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Feeling abnormally sleepy or tired during the day is commonly known as drowsiness. When yawns did spread between strangers, it took longer for that second yawn to start than when yawns spread between family and friends.
Central sleep apnea is a sleep disorder in which you briefly stop breathing during sleep. It isn't the same as simply feeling drowsy or sleepy. More From Weird Health Symptoms.
Top level comments must contain a genuine attempt at an answer All direct answers to a post must make a genuine attempt to answer the question. So it makes sense that further research discovered that yawns are more contagious the closer you are to someone. But before you freak: Or a stroke.
Generalizations like that are unnecessary. Human displacement activities include head-scratching and phantom beard-scratching, while birds are sometimes seen pecking the ground during fights.
Whenever I begin reading aloud to my children or students I begin yawning over and over again. This can help them determine whether your excessive yawning is occurring as a result of being fatigued or having a sleep disorder.
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If nothing else works, you might want to have a physical with blood work to make certain you're not anemic, also, as this often is a hidden cause of frequent yawning. Civil disagreements can happen, but insults should not. In an incredibly meta experiment, the study participants were recorded watching video recordings of people yawning, to see how often they themselves yawned.