You know what it looks like… but what is it called?
TAKE THE QUIZ“Slow wave”
We have one entry that includes the term Slow wave.
slow-wave sleep
noun: the phase of non-REM sleep marked by the deepest sleep and the highest levels of delta wave activity with brain and muscle activity significantly reduced, loss of response to external stimuli greatest, and with heart rate and respiration at lowest levels —abbreviation SWS
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Merriam-Webster unabridged