Since 2004, scientific research has shown that a full night of sleep may lend itself to a burst of insight in the morning. The research team found that even a 20-minute nap could deliver a "eureka" ...

The benefit of a short nap is that you keep your body from entering deep sleep, which leaves you feeling groggy and more tired. For me, 10 or 12 minutes is about perfect. Anything longer than 20 ...