Nocturnal wakefulness as a previously unrecognized risk factor for suicide - Perlis, Michael L.; Dinges, David F.; Thase, Michael E.; Chaudhary, Ninad S.; Gehrman, Philip R.; Morales, Knashawn H.; Chakravorty, Subhajit; Basner, Mathias; Brown, Gregory K.; Grandner, Michael A. (The journal of clinical psychiatry, 2016)