Delta waves are seen in

Delta waves are seen in

    1. Deep sleep
    1. REM sleep
    1. Awake state
    1. Stage I NREM sleep

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Stages of sleep and rhythm

  •    Beta rhythm- Alert, awake, maximum concentration.
    
  •    Alpha rhythm- Eyes closed, mind wandering, less attentiveness
    
  •    Theta rhythm- Stage 1 NREM
    
  •    Sleep spindles, K complex- Stage 2 NREM
    
  •    Delta rhythm- Deep sleep (Stage 3 & 4 NREM)
    
  •    Beta Rhythm and occasional reappearance of alpha rhythm- REM