To take a classic ten-minute power nap, Kirsty Kerin, a sleep researcher with Circadian Technologies, suggests:
Find a cool, dark place that has white noise, like a fan or computer hum. Set an alarm clock for 15 minutes later. Take deep, slow breaths and let your mind wander. If you don't fall asleep within five minutes, you probably don't need the nap.
Have a routine, like taking off your shoes and turning off the ringer on your phone, that you do every time before you nap. And remember, some researchers say napping is addictive, so you may not want to do this every day – unless, like Churchill, you can plan your cabinet meetings around your naps.