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1. They make a habit of napping
1. They make a habit of napping
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It’s been shown that lack of sleep causes weight gain, leads to a compromised immune system and increases the production of cortisol, a hormone that triggers stress.

But Sarnoff Mednick, professor emeritus of psychology at the University of Southern California, doesn’t worry about such things.

As profiled by Gene Stone in his book The Secrets of People Who Never Get Sick, Mednick would take an afternoon nap for most of his adult life and never suffered from colds or flu.

The fact is, until about the 13th century and the invention of mechanical clocks, humans napped daily.

The best time for a short snooze: Between the hours of one and three in the afternoon.

Most of us ditched our daily naps after preschool, but scientific experiments suggest that was likely a mistake.

Having a snooze – even one as short as ten minutes – can improve alertness, memory and cognitive performance.

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