A recent study issued by the Princeton University that the biological function of the process of yawning is to regulate the temperature of the brain, And cooled from high temperatures, but did not deny the fact that at the same time yawning and means to express boredom or fatigue and the need to sleep for eternity.
The researchers found the results of this study follow-up after about 160 people, volunteers, and calculate the rate of yawning in the summer and winter, in addition to follow-up 80 in the fall and spring.
The results indicated that the rate of yawning volunteers was greater in summer compared to winter and warm atmosphere, and the researchers attributed to the fact that the temperature of the warm air in the summer does not work to cool the brain in the required manner as occurs with the cold winter.
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