"The benefits of brief (5-15 min) naps are almost immediate after the nap and last a limited period (1-3h). Longer naps (> 30 min) can produce impairment from sleep inertia for a short period after waking but then produce improved cognitive performance for a longer period (up to many hours)." - Lovato N, Lack L.
http://www.ncbi.nlm.nih.gov/pubmed/21075238
"The only safe counter measure to driver sleepiness, particularly when the driver reaches the stage of fighting sleep, is to stop driving, and-for example, take a 30 minute break encompassing a short (<15 minute) nap or coffee (about 150mg caffeine), which are very effective particularly if taken together." - Reyner LA, Horne JA.
http://www.lboro.ac.uk/departments/ssehs/research/centres-institutes/sleep/publications/driver_sleepiness.html
"Results indicate that motor learning was consolidated in a brief nap and was associated with stage 2 spindles, but only for those who habitually take naps." - Catherine E. Milnera, Stuart M. Fogela and Kimberly A. Cote
http://www.sciencedirect.com/science/article/pii/S0301051106000299
"Mark Rosekind, PhD, President and Chief Scientist of Alertness Solutions in California and former Director of the Fatigue and Countermeasures Group at the National Aeronautics and Space Administration (NASA), conducted an experiment in which he instructed NASA pilots to take short naps when possible during long haul flight operations. Dr. Rosekind found that compared to long haul pilots who did not nap, the napping pilots had a 34% boost in performance and a 54% boost in alertness that lasted for 2-3 hrs." - healthcentral.com
http://www.healthcentral.com/sleep-disorders/napping-192940-5.html
"A six-year Greek study found that those who took a 30-minute siesta at least three times a week had a 37% lower risk of heart-related death." - BBC
http://news.bbc.co.uk/2/hi/health/6354855.stm
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