<prompt> Alpha-wave in EEG is seen inSleepREM sleepAwake stateMental work  <response>: 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 alpha rhythm- REMIn alpha, rhythm patient is awake, not asleep. 