Home Science Humans A Lack of Sleep Shrinks Men's Testicles

A Lack of Sleep Shrinks Men’s Testicles

The opener to Matthew Walker’s TED Talk is not exactly what you’d expect to hear in a lecture about sleep.

“Men who sleep five hours a night have significantly smaller testicles than those who sleep seven hours or more,” Walker, a UC Berkeley professor of psychology and neuroscience, told the audience at the popular media organization’s April 15-19 conference in Vancouver, Canada.

That got everyone’s attention.

The video of Walker’s 19-minute “Sleep is your superpower” talk was just posted on the TED Talks website and received more than 1 million views in the first 72 hours (as of publication, it’s up to more than 1,650,000).

Aria Bendix, an innovation reporter for Business Insider who watched more than 100 talks at the conference, was impressed. She wrote in her review of the conference:

In his talk, Walker, author of the bestseller Why We Sleep and director of the campus’s Center for Human Sleep Science, reviews what happens to the brain and the body when we don’t get enough nightly shut-eye. Walker told Berkeley News:

Walker noted that a growing body of research links sleep deprivation to such diseases as cancer, Alzheimer’s, obesity, diabetes, hypertension, heart disease, and stroke, as well as anxiety and depression. A sleep evangelist, Walker’s goal is to reverse a trend in which people, especially younger generations, get less sleep than they need — and brag about it. He said:

Provided by: Yasmin Anwar, UC Berkeley [Note: Materials may be edited for content and length.]

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  • Troy was born and raised in Australia and has always wanted to know why and how things work, which led him to his love for science. He is a professional photographer and enjoys taking pictures of Australia's beautiful landscapes. He is also a professional storm chaser where he currently lives in Hervey Bay, Australia.

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