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Noun: NREM sleep
  1. A recurring sleep state during which rapid eye movements do not occur and dreaming does not occur; accounts for about 75% of normal sleep time
    "The study monitored patients during periods of NREM sleep";
    - orthodox sleep, nonrapid eye movement sleep, nonrapid eye movement, NREM

Type of: shuteye [informal], shut-eye [informal], sleep, slumber

Encyclopedia: NREM sleep