When we take short naps, the part of our brain that is always on when we are awake has the opportunity to take a break. Much like a fatigued muscle rejuvenates during a short breather, so, too, does this part of our brain. In a critical review on the efficacy of napping, sleep scientists found that a 10-minute nap yields the greatest benefits, though most experts say anything under 30 minutes is effective. Even if you don’t actually experience the sensation of falling asleep, simply closing your eyes can help switch your active brain off, allowing it to recover. Staying asleep for more than 30
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