Sleep disorder or simple sleep ontogeny? Tendency for morningness is associated with worse sleep quality in the elderly - Barbosa, Ana Alves; Miguel, Mario André Leocadio; Tufik, Sérgio; Sabino, Flávia Cal; Cendoroglo, Maysa Seabra; Pedrazzoli Neto, Mario (Brazilian Journal of Medical and Biological Research, 2016)