Theta waves (4 to 8 Hz): Theta brain waves are present during deep meditation and light sleep, including the important REM dream state. This is the domain of your subconscious and only experienced momentarily as you drift off to sleep from alpha or wake from deep sleep (delta waves). We are more receptive to insights and information beyond our normal conscious awareness in this state. Some experts state that theta meditation amplifies intuition and other extrasensory perception skills.