DEEP SLEEP By N., Pam M.S. - April 7, 2013 A stage of the sleep cycle where arousal thresholds are high. See also wave sleep. DEEP SLEEP: "Deep sleep shows up as delta waves on an EEG." Related Psychology Terms SLEEP STAGES STAGE 3 SLEEP STAGE 4 SLEEP AUDITORY THRESHOLD I SLEEP CYCLE SEXUAL-RESPONSE CYCLE SLEEP SLEEP PATTERN CYCLE OF VIOLENCE AUTOEROTICISM Cite this page: N., Pam M.S., "DEEP SLEEP," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/deep-sleep/ (accessed July 3, 2020).