Effects of acute systemic administration of cannabidiol on sleep-wake cycle in rats - Chagas, Marcos Hortes Nisihara; Crippa, José Alexandre de Souza; Zuardi, Antonio Waldo; Hallak, Jaime Eduardo Cecílio; Machado-de-Sousa, João Paulo; Hirotsu, Camila; Maia, Lucas; Tufik, Sergio; Andersen, Monica Levy (Journal of Psychopharmacology, 2013)