Tello Rodriguez, Tania, Luis Varela Pinedo, Pedro José Ortiz Saavedra, Helver Chàvez Jimeno, and Carlos Revoredo Gonzáles. 2009. “Sleep Quality, Daily Sleepiness and Sleep Hygiene at “Centro Del Adulto Mayor” in Lima, Perú”. ACTA MEDICA PERUANA 26 (1), 22 - 26. https://amp.cmp.org.pe/index.php/AMP/article/view/1490.