During a typical night’s sleep, the brain’s activity fluctuates. The first three stages of sleep are characterised by three types of brainwaves: alpha waves, theta waves and delta waves.
Delta waves (0.5-4 Hz) signify a state of deep sleep. A binaural beat with a frequency between 4 and 7 Hz, for example, is more likely to align with theta brain waves, promoting sleep and relaxation.