Why Do We Stretch in the Morning?

Humans (and our pets) frequently instinctively stretch as soon as we wake up. But why? What is happening in our bodies when we stretch and yawn to wake ourselves up?

Hosted by: Hank Green
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Sources:
http://theweek.com/articles/442303/10-serioussounding-medical-conditions-that-arent-serious

http://essentialsomatics.com/hanna-somatics-articles-case-studies/pandiculation-safe-alternative-stretching

http://gravitywerks.com/pandiculate-your-way-to-health/

http://www.pharmaceutical-journal.com/opinion/blogs/yawning-warning-why-do-we-yawn/20068249.blog

http://healthyliving.azcentral.com/stretch-after-sleeping-10346.html

http://www.livestrong.com/article/355285-why-do-you-stretch-after-sleeping/

http://www.sciencefocus.com/qa/why-do-we-stretch-when-we-wake

http://www.washparkchiro.com/why-babies-and-animals-stretch-and-you-should-too/