“…This study did not focus on chronotype though . Most of our knowledge about the sleep-wake cycle stems from countries of the northern hemisphere, especially the US, Europe, Japan and Taiwan or from Australasia (Carrier, Monk, Buysse, & Kupfer, 1997;Gradisar, Gardner, & Dohnt, 2011;Ishihara, Miyake, Myasita, & Miyata, 1988;Ohayon, Carskadon, Guilleminault, Vitiello, & others, 2004;Park, Matsumoto, Seo, Shinkoda, & Park, 1997;Taillard, Philip, Chastang, & Bioulac, 2004;Tonetti, Fabbri, & Natale, 2008;Vinha, Cavalcante, & Andrade, 2002) .…”