A delta wave is a high amplitude brain wave with a frequency of oscillation between 0–4 hertz. Delta waves, like other brain waves, are recorded with an electroencephalogram (EEG) and are usually associated with the deepest stages of sleep (3 and 4 NREM), also known as slow-wave sleep (SWS), and aid in characterizing the depth of sleep.
Read more about Delta Wave: Background and History, Classification and Features, Development, Disruptions and Disorders, Consciousness and Dreaming, Pharmacology, Effects of Diet
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“Wind goes from farm to farm in wave on wave,
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There may be little or much beyond the grave,
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—Robert Frost (1874–1963)
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