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Non-Rapid Eye Movement (NREM) sleep, which is divided into three stages, is a phase of sleep without rapid eye movements. The transition into NREM sleep is marked by a general shift in brain wave activity, characterized by a decrease in frequency and an increase in amplitude. Each stage within NREM sleep has its own distinct pattern of brain waves.

Non-Rapid Eye Movement (NREM) Sleep

Stage 1 sleep marks the transition from wakefulness to sleep and is characterized by a shift in brainwave patterns from alpha waves to theta waves. During this initial, light phase of NREM sleep, physiological processes like respiration and heart rate begin to slow, accompanied by a decrease in muscle tension and core body temperature. Individuals in this stage can be easily awakened.

Stage 1 Sleep

Stage 2 sleep, or NREM2, is a phase characterized by a state of deep relaxation. During this stage, theta waves are the predominant brain activity, but they are punctuated by two distinct features: sleep spindles, which are brief bursts of high-frequency brain waves, and K-complexes, which are high-amplitude patterns of brain activity.

Stage 2 Sleep

Non-REM (NREM) sleep is not a uniform state but progresses through three distinct stages, each with unique characteristics. These stages are differentiated primarily by their brain wave patterns, moving from the light sleep of Stage 1 to the deep, slow-wave sleep of Stage 3.

Comparison of Non-REM Sleep Stages

Also known as deep sleep or slow-wave sleep, Stage 3 is a phase of NREM sleep defined by the presence of high-amplitude, low-frequency delta waves. During this stage, physiological functions such as heart rate and respiration decrease significantly, making it very difficult to awaken the individual.

Stage 3 Sleep (Slow-Wave Sleep)

As an individual transitions from a state of relaxed wakefulness into the phases of sleep characterized by the absence of rapid eye movements, what is the general trend observed in their brain wave patterns?

Night terrors are episodes of intense panic that occur during NREM sleep, often involving screaming and attempts to flee. During an episode, individuals may appear awake but are unresponsive to consolation and typically have no memory of the event afterward. They usually fall back to sleep quickly once the episode ends.

Night Terror

As an individual transitions from a state of quiet wakefulness into the phases of sleep characterized by a lack of rapid eye movements, what is the most accurate description of the general change in their brain wave activity?

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