<prompt> Waves seen in EEG during stage 4- NREM period of sleep is:AlphaBetaDeltaTheta  <response>: - REM sleep shows - b waves - so, called as paradoxical sleep. because even though the person is asleep, the waves of ale wakefulness-b waves are recorded- NREM sleep - 4 stages Stage I - Superficial stage - eyes closed person is in sleep latency - a waves are seen Stage II - Sleep spindles large K - complexes are seen Stage III - Theta waves are seen. Stage IV - Deeper stages of sleep - delta waves are seen 