EEG rhythm recorded from the surface of the scalp during REM sleepa) Alphab) Betac) Deltad) Theta

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