The National Sleep Foundation recommends taking naps between 20-30 minutes. Naps of this length help to ‘improve mood, alertness and performance without leaving you feeling groggy or interfering with nighttime sleep’ (http://sleepfoundation.org/sleep-topics/napping).
Naps aren’t just for kids; they can be an important part of adulthood as well. Notably, John F. Kennedy, Lyndon B. Johnson and Ronald Reagan all valued naps. If a number of our presidents have taken naps seriously, it may be time for the rest of society to take them a bit more seriously as well.