In fact, the link between a lack of sleep and cancer is now so strong that recently the World Health Organization decided to classify any form of nighttime shift work as a probable carcinogen. And that list currently includes cancer of the bowel, cancer of the prostate, as well as cancer of the breast. And that's the reason that we know that short sleep duration predicts your risk for developing numerous forms of cancer. So after just one night of four to five hours of sleep, there is a 70% reduction in critical anticancer-fighting immune cells called natural killer cells. We also know that a lack of sleep impacts your immune system. So a lack of sleep will age you by almost a decade in terms of that aspect of virility and wellness. We know that men who are sleeping just five to six hours a night have a level of testosterone which is that of someone ten years their senior. Firstly, we know that sleep deprivation affects the reproductive system. What are the effects of sleep deprivation on the body? Well, there are many different effects. The more protein that builds up, the greater your risk of going on to develop dementia in later life. So if you're not getting enough sleep each and every night, more of that Alzheimer's-related protein will build up. We also know that a lack of sleep will lead to an increased development of a toxic protein in the brain that is called beta-amyloid and that is associated with Alzheimer's disease because it is during deep sleep at night when a sewage system within the brain actually kicks in to high gear and it starts to wash away this toxic protein, beta-amyloid. You can't essentially make and create those new memories. So those new incoming informational emails are just bounced, and you end up feeling as though you're amnesiac.
We certainly know that a lack of sleep will actually prevent your brain from being able to initially make new memories, so it's almost as though without sleep the memory inbox of the brain shuts down and you can't commit new experiences to memory. Matthew Walker: My name is Matthew Walker, I am a professor of neuroscience and psychology at the University of California, Berkeley, and I am the author of the book " Why We Sleep." Account icon An icon in the shape of a person's head and shoulders.
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