Binaural rhythms
Binaural rhythms have sounds that alternate between the the right and left ears. The rhythm and sound frequencies may help the brain reach a deeper state of relaxed brain waves. It is best experienced with headphones/earbuds or possibly in small car with right and left stereo speakers. An example can be heard online: Remove Mental Blockages & Subconscious Negativity ☯ Dissolve Negative Patterns - Binaural Beats (youtu.be).
Breathing in a steady calm rate can help our brain waves and mood also become more steady and calm. Health benefits may help the cardiovascular system and reduce oxidative stress. (forbes.com/breathing)
Hypnosis, some types of meditation and yoga, and certain very low frequencies played in rhythm similar to the heart beat also may help calm the brain waves and possibly help us reach a different type of consciousness. (FOIA/CIA-Analysis and Assessment of Gateway Process, cia.gov/pdf) Somewhat similar rhythmic sounds are available on music and/or guided meditation CDs by the BrainSync company or others.
Disclaimer: This information is being provided for educational purposes within the guidelines of fair use. Please see an individual health care provider for individual health care services.