Yawning is body's "thermostat" - Telegraph:
'via Blog this'
Like a computer the brain works best when it is cool, but putting too great a strain on it can lead to overheating which reduces its ability to process information.
When the head begins to heat up, yawning acts as a natural "thermostat" by allowing cool air to rush in and bring the brain back down to a healthy temperature, research suggests.
A study of 160 volunteers in Arizona found that people yawned almost twice as much in winter, when their body temperature was higher than the air around them, than in summer.
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