Studies show that 20 - minute power naps when the afternoon slump hits can increase productivity going forward. (womenshealthandfitness.com.au)
Then, making sure that you proceed with taking the power nap within 10 - 15 minutes of the coffee consumption to gain the effectiveness of a 15 - 20 minute power nap before the caffeine kicks into play. (consumerhealthdigest.com)
If you have an office with a door or another place to grab a snooze, take a 20 - minute power nap for a great energy boost. (lawyerist.com)