However, almost paradoxically, it is theorized that yawning is not a sign of sleepiness or boredom, but actually a reflex that your brain induces to wake you up or make you more alert. Yawning is associated with some hormones that are released that briefly increase the heart rate and alertness. I suppose this is an evolutionary response related to a time where if one were asleep or inattentive something bad might happen to you!
Related to arousal is the common phenomenon of yawning upon awakening after sleep or nap. This is further evidence that yawing is a stimulation and arousal reflex rather than the opposite.
A final theory on the cause of yawning is that it is a reflex that helps cool a warm brain. This is unproven and although there are some examples of yawning in heat related scenarios, yawing is not something we see when playing sports or playing in the sun. Physiologically, deep breaths and open mouths can cool the brain slightly, but the evidence that this is a real cause of yawning is not convincing.
A logical but disproven theory on why we yawn is to improve oxygen in the blood or remove carbon dioxide. This seems logical since yawning does bring in more oxygen with a deep breath and the expiration removes more carbon dioxide than the usual breath, but research by putting people in low-oxygen or high- carbon-dioxide environments does not cause yawning.
The short answer is that yawning is normal. Ear stretching is when you gradually stretch out pierced holes in your earlobes. Learn about how to safely stretch your ears and the materials you'll…. Cissexism is based on the assumption that all people are cisgender. This is so deeply ingrained in our society, so many people say and do things that…. Electromagnetic hypersensitivity EHS is a defined by unpleasant symptoms, like headaches and pain, triggered by exposure to electronic devices.
A health insurance deductible is a specified amount or capped limit you must pay first before your insurance will begin paying your medical costs…. Health Conditions Discover Plan Connect. Medically reviewed by Cameron White, M. Is yawning contagious? Ways to stop yawning. Read this next. Medically reviewed by Deborah Weatherspoon, Ph. Jaw Popping. Why Am I so Tired? Medically reviewed by Suzanne Falck, MD. Medically reviewed by Elaine K. Luo, M. Medically reviewed by Grant Tinsley, PhD. Yawning in neurology: a review.
Arq Neuropsiquiatr. PMID: pubmed. Updated by: Linda J. Editorial team. Yawning - excessive. Causes may include: Drowsiness or weariness Disorders associated with excessive daytime sleepiness Vasovagal reaction stimulation of a nerve called the vagus nerve , caused by heart attack or aortic dissection Brain problems such as tumor , stroke , epilepsy , multiple sclerosis Certain medicines rare Problem with the body's temperature control rare.
When to Contact a Medical Professional. Call your health care provider if: You have unexplained and excessive yawning.
The yawning is associated with being very sleepy in the daytime. What to Expect at Your Office Visit.
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