The first group would take all three hours at once, the second would sleep an hour and a half at night and then take three naps during the day and the last group —the true polyphasics— would take their sleep in half-hour naps every four hours. After establishing a baseline performance after eight hours of sleep, he compared the results: After more than a month, the first group showed a loss of 30% , the second 25% and the third only 12% in performance. He is the editor and contributor of three chapters to Why We Nap: Evolution, Chronobiology, and Functions of Polyphasic and Ultrashort Sleep. The book is considered a reference on the subject and widely available in academic libraries, six editions were published between 1992 and 2014 with a foreword by Jürgen Aschoff, the co-founder of the field of chronobiology. He also wrote more than 100 research papers on his work. Publications Why We Nap: Evolution, Chronobiology, and Functions of Polyphasic and Ultrashort Sleep. Boston, Basel, Berlin: Birkhauser (1992) References External links Short bio Italian sports physicians University of Bologna alumni Italian emigrants to the United States Sleep researchers Living people Volvo Ocean Race sailors Italian male sailors (sport) 1953 births