<prompt> Buerger waves alpha waves of EEG have the rhythm per sec of0-47-Apr13-Aug13-30  <response>: Stages of sleep and rhythm- Beta rhythm- Alert, awake, maximum concentration- 13-30Hz- Alpha rhythm- Eyes closed, mind wandering, less attentiveness- 8-13Hz- Theta rhythm- Stage 1 NREM- 4-7 Hz- Sleep spindles, K complex- Stage 2 NREM- Delta rhythm- Deep sleep Stage 3 4 NREM- 3-5 Hz- Beta Rhythm and occasional alpha rhythm- REM 