Web Reference: The function of a spontaneous yawn has been the subject of several theories, but the thermoregulation hypothesis is the most supported. This theory posits that yawning functions as a mechanism to cool the brain, which operates optimally within a narrow temperature range. Mar 15, 2024 · Yawning begins in the womb as early as the 11th week of pregnancy and continues for a lifetime. When you yawn, a wetting agent known as a surfactant coats the tiny air sacs (alveoli) in your... Oct 16, 2023 · When you yawn, several muscles in your face tense and stretch. Sometimes, this can pull on and stimulate your lacrimal glands, which leads to tears and watery eyes.
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