Takeyama, Hidemaro, Shun Matsumoto, Kensaburo Murata, Takeshi Ebara, Tomohide Kubo, Norihide Tachi, e Toru Itani. 2004. “ Effects of the Length and Timing of Nighttime Naps on Task Performance and Physiological Function ”. Revista De Saúde Pública 38 (supl.): 32-37. https://doi.org/10.1590/S0034-89102004000700006.