Sleep helps to repair damaged DNA in neurons, scientists find

Ernest Hemingway prized sleep for good reason. Not one to dwell on rest and recuperation, the novelist saw snoozing as a form of damage limitation. “I love sleep,” he once said. “My life has the tendency to fall apart when I’m awake.” The author’s observation might be truer than he imagined. In a new study, scientists found that broken DNA builds up in brain cells in the daytime, and that repair work only reverses the damage during sleep.

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