Stages of sleep (1, 2, 3, 4)
stage 1-2: During early, light sleep the brain enters a lowamplitude,regular wave form called theta waves (5-8cps). A person who is daydreaming showstheta activity. stage 3-4: During deepest sleep, brain activity slows down. There are largeamplitude,slow delta waves (1.5-4cps). High and low waves.