Sara C. Mednick is a sleep researcher at the Salk Institute of Biological Studies. Her research is strongly focused on the relationship between napping and performance. She is the author of several papers and a mass market title on the subject, Take a Nap! Change Your Life.
References
Take a Nap! Change Your Life Book
Siesta Time Story in The Economist about restorative power of mid-day naps on visual performance tests
Snooze Time Story in Science News reporting on the same study