The idea of “getting your beauty sleep” may sound old fashioned—something your grandma might have said to your mom, an old wives’ tale to get little girls to go to bed. But modern science is 100 percent on Grandma’s side. Beauty sleep is as real as it gets.
It all has to do with the hormones the brain excretes—and those it suppresses—during sleep. Though REM sleep is widely known as the brain’s magic elixir, Stages 3 and 4, known as deep non-REM sleep, are when the human growth hormone is produced, which is a major agent for keeping skin healthy. Growth hormone is so good at repairing and restoring skin that getting injections of it has become a Hollywood fad. But what celebrities spend thousands of dollars at their local plastic surgeon, you can get for free with an excellent night of sleep.
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