Discovery News - The Yawn Explained: It Cools Your Brain
A new theory on yawning as a biological function (not a social function e.g. the contagious yawn) in parakeets shows that they take in large amounts of air when it is cooler than the body. Exhaustion and sleep deprivation tend to heat some centers of the brain, thus explaining yawning in those cases. Yawning upon waking has been associated with raising states of arousal, but also perhaps facilitating transitional brain states.
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