Alpha waves (8-12 Hz) happen when we are relaxed with eyes closed, as in meditation. Theta waves (4-7 Hz) are common in the lighter stages of sleep or the transition from waking to sleeping.
Brain Waves Isochronic Tones Brain Wave Sine Wave Binaural Beat Music With Alpha Waves, Delta, Beta, Gamma, Theta Waves Lucid Dreaming Music for Meditation and Relaxation Isochronic Tones and ...