In 2006, sleep specialist Sara Mednick wrote an award-winning book, "Take a Nap! Change Your life."
Now, 16 years later, she is following it with a how-to guide for re-charging your batteries while you're awake.
Mednick, who lives in Kensington, California, is a professor of cognitive science at UC Irvine. She runs a sleep lab there that collects and analyzes data on people's sleep patterns and their effects.
