NOCTURNAL By N., Sam M.S. - 15 describes activity which occurring's normally during the dark period of a daily cycle. NOCTURNAL: "Some species of bat for example are nocturnal creatures who are only active at night." Related Psychology Terms ADOLESCENCE (Theories) DREAM-STATE (D-STATE, REM- STATE) PRENATAL DEVELOPMENT BRAIN WAVES (Electroencephalogram, EEG) ORAL CHARACTER Piaget’s Theory of Cognitive Development PMDD: Can It Be Cured? RORSCHACH TEST AER HUNGER CHILD PSYCHIATRY Cite this page: N., Sam M.S., "NOCTURNAL," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/nocturnal/ (accessed July 2, 2022).