Marla Broadfoot in Smithsonian Magazine:
Everyone has heard that it’s vital to get seven to nine hours of sleep a night, a recommendation repeated so often it has become gospel. Get anything less, and you are more likely to suffer from poor health in the short and long term—memory problems, metabolic issues, depression, dementia, heart disease, a weakened immune system.
But in recent years, scientists have discovered a rare breed who consistently get little shut-eye and are no worse for wear.
Natural short sleepers, as they are called, are genetically wired to need only four to six hours of sleep a night. These outliers suggest that quality, not quantity, is what matters. If scientists could figure out what these people do differently it might, they hope, provide insight into sleep’s very nature.
“The bottom line is, we don’t understand what sleep is, let alone what it’s for. That’s pretty incredible, given that the average person sleeps a third of their lives,” says Louis Ptáček, a neurologist at the University of California, San Francisco.
More here.
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