S SLEEP By N., Pam M.S. - April 28, 2013 Recurrent period of deep sleep distinguished by the presence of slow brain waves and by very little dreaming. Compare with: D sleep. S SLEEP: "S sleep is one of the deepest stages of sleep." Related Psychology Terms SYNCHRONIZED SLEEP BURST-PAUSE FIRING THETA WAVE STAGE 4 SLEEP STAGE 3 SLEEP SLEEP STAGES PONTINE SLEEP D SLEEP KAPPA WAVE NREM SLEEP Cite this page: N., Pam M.S., "S SLEEP," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/s-sleep/ (accessed October 8, 2019).