<prompt> Which is the stage of sleep in which we spend maximum time?Stage N1Stage N2Stage N3REM  <response>: Ans. B. Stage N2Sleep is scored in epochs of 30 seconds, with stages of sleep defined by visual scoring of 3 parameters: electroencephalogram EEG, electrooculogram EOG electromyogram EMG recorded beneath chin.1. NREM: Stage 1: 1st stage, light sleep, loss of alpha waves eyes closed but awake and predominant theta waves Stage 2: maximum time spent. Findings in EEG include- Sleep spindles: bursts of waves of frequency of 11-16Hz- K-complexes: high voltage spikes, negative sharp waves followed by positive waves Stage 3: Deepening of sleep, appearance of delta waves. Stage 4: Deep sleep characterized by delta waves- New NREM stages: N1 stage 1, N2 stage 2, N3 stage 342. REM sleep: aka paradoxical sleep EEG: beta wave similar to awake state, alpha wave 