Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Noun: nonrapid eye movement 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
    - orthodox sleep, NREM sleep, nonrapid eye movement, NREM

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