'There was a 70% drop in Natural Killer (immune) cell activity following one night of only four hours of sleep.
Imagine the state of your immune system after weeks, if not months, of insufficient sleep.
It should perhaps then come as no surprise to learn that we now have significant links between short sleep and numerous forms of cancer. Currently the list includes cancer of the bowel, cancer of the prostate, and cancer of the breast.
In fact, the link between a lack of sleep and cancer is so pronounced, that recently the WHO decided to classify any form of nightime shift work as a probable carcinogen.
Short sleep predicts a shorter life – it predicts all cause mortality.'
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