What is the term for the non-dreaming stage of sleep without rapid eye movement?

NREM sleep, or Non-Rapid Eye Movement sleep, is the correct term for the non-dreaming stages of sleep characterized by the absence of rapid eye movement. This phase includes several stages of sleep that are crucial for physical and mental restoration. During NREM sleep, the body undergoes vital processes like tissue repair, growth, and immune function strengthening.

The significance of NREM sleep lies in its contribution to overall health, as it supports deep restful sleep and allows the brain to consolidate memories. This phase contrasts with REM sleep, where dreaming occurs and the brain activity resembles wakefulness. Deep sleep is a subset of NREM sleep, specifically associated with the most restorative phases. The awake state is simply when an individual is not asleep at all and is more alert to their environment. Thus, NREM sleep encompasses the broader context of non-dreaming sleep stages, making it the most suitable answer.