Yawning is a normal thing. Tiredness, sleepy and sitting at one place are the reasons for it. Some people when they see others yawning then they also automatically yawn. This is a process performed by the body to reduce the temperature of brain. But people who take more than one in big voice. That means their body is lack of oxygen. If the yawning is exceeding its limits then the reason will lack of sleep. Doctors have found that in less people yawning is the significance of heart problems.
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