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Why Do We Stretch When We Are Tired?

[Summary]human biology Humans and other animals have lots of innate behaviors that are not learned from observation, i.e. behaviors that are hard-wired into our nervous system, and this is one of them. Suckling reflexes in mammals and the Moro reflex is human

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human biology

Humans and other animals have lots of innate behaviors that are not learned from observation, i.e. behaviors that are hard-wired into our nervous system, and this is one of them. Suckling reflexes in mammals and the Moro reflex is human babies (which we grow out of) are other simple examples.

The stretching behaviours you are referring to are usually labelled pandiculation in humans (defined as involuntary stretching of the soft tissues), and yawning is often considered a special case of this. These kinds of behaviours are also normally related to transition periods between high-low activity in animals (Walusinskie, 2006). In practice, stretching functions as a way to reverse the muscular atonia during REM sleep, and is in this sense a way to restore homeostatic functions (Fraser, 1989; Walusinskie, 2006).

Why do people stretch their bodies when they tired?

Why Do We Stretch When We Are Tired?

Why do people stretch their bodies when they tired? Also does anyone know why people yawn?

Why Do I Yawn?

Everybody yawns — from unborn babies to the oldest great-grandparent. Animals do it, too. But why, exactly, do people and animals yawn? No one knows for sure. But there are many theories (ideas) about why people yawn.

One is that when we are bored or tired, we just don't breathe as deeply as we usually do. As this theory goes, our bodies take in less oxygen because our breathing has slowed. Therefore, yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood.

Why do we yawn? (Everyday Mysteries: Fun Science Facts from the Library of Congress)

Why do we yawn?

Yawning might serve a social function (to communicate boredom) and a physiological function (regulation of body state).

The study of yawning is anything but boring. It boasts a rich history of theories that go back to Antiquity, but thus far the biological function of yawning remains a mystery.

Why do we stretch when we feel tired? | Yahoo Answers

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Why Do We Yawn?

You've probably seen someone yawn and felt compelled to take a deep inhale and exhale yourself. Yes, yawning is contagious, but why do we actually do it in the first place? Trace takes a look at the competing theories out there.

Read More:
http://www.loc.gov/rr/scitech/mysteri...
Development of Fetal Yawn Compared with Non-Yawn Mouth Openings from 24-36 Weeks Gestation
http://www.plosone.org/article/info:d...
"Although some research suggests that fetuses yawn, others disagree arguing that is it simple mouth opening."

"Why do we stretch when tired?"

Why Do We Stretch When We Are Tired?

See what others are saying.

Tired of Being Tired : zen habits

‘A man grows most tired while standing still.’ ~Chinese proverb

Post written by Leo Babauta.

It’s tough being tired all day. I’ve had days like this, when I’m struggling through the day and don’t have the energy to tackle anything that matters.

Hell, I’ve had years like this.

When you’re tired, not much seems appealing. Life is dulled, and you don’t get much accomplished. Worst, you don’t have the energy to change the situation.

It's NOT a sign of boredom. It DOESN'T boost oxygen in the brain. So why DO we yawn?

Scientists have tried for years to find a clearly-defined physical purpose for yawning — and utterly failed. This odd habit has left experts open-mouthed with bafflement.

Yawn

A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath.

Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality.[1] It is commonly associated with tiredness, stress, sleepiness, or even boredom and hunger, though studies show it may be linked to the cooling of the brain.[2] In humans, yawning is often triggered by others yawning (e.g., seeing a person yawning, talking to someone on the phone who is yawning) and is a typical example of positive feedback.[3] This "contagious" yawning has also been observed in chimpanzees, dogs, birds, and reptiles, and can occur across species.[4][5] Approximately 20 physiological reasons for yawning have been proposed by scholars, but there is little agreement about its main functions.[1]

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