STAGE 1 SLEEP By N., Pam M.S. - April 13, 2013 the initial stage of sleep with low amplitude waves with an irregular frequency. Read sleep stages for clarity. STAGE 1 SLEEP: "Stage 1 sleep is the early stage of sleep." Related Psychology Terms STAGE 3 SLEEP STAGE 2 SLEEP SLEEP STAGES SLEEP SPINDLES STAGE 4 SLEEP SLOW-WAVE SLEEP BURST-PAUSE FIRING BRAIN WAVES FOURIER SPECTRUM KAPPA WAVE Cite this page: N., Pam M.S., "STAGE 1 SLEEP," in PsychologyDictionary.org, April 13, 2013, https://psychologydictionary.org/stage-1-sleep/ (accessed December 13, 2019).