Delta wave

For the medical syndrome, see Wolff–Parkinson–White syndrome. For the television show, see Delta Wave.

Delta waves are high amplitude neural oscillations with a frequency between 0.5 and 4 hertz. Delta waves, like other brain waves, can be recorded with electroencephalography (EEG). They are usually associated with the deep stage 3 of NREM sleep, also known as slow-wave sleep (SWS), and aid in characterizing the depth of sleep. Suppression of delta waves leads to impaired body recovery, reduced brain restoration, and poorer sleep.

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