What term do sleep researchers use to designate Stages 1-4 of sleep?

Name: What term do sleep researchers use to designate Stages 1-4 of sleep?
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Sleep researchers use the term "Non-REM sleep" to designate Stages 1-4 of sleep. REM sleep is a separate stage of sleep that is characterized by rapid eye movements and increased brain activity, and occurs after Non-REM sleep. REMN sleep and SCN sleep are not commonly used terms in sleep research. Paradoxical sleep is another term for REM sleep.

What Term Do Sleep Researchers Use to Designate Stages 1-4