![]() Stage 2 – no eye movement occurs, and dreaming is very rare.During the transition into stage-1 sleep, it is common to experience hypnic jerks. People aroused from this stage often believe that they have been fully awake. Alpha waves disappear and the theta wave appears. This state is sometimes referred to as relaxed wakefulness. Stage 1 – occurs mostly in the beginning of sleep, with slow eye movement.That has been reduced to three in the 2007 update by The American Academy of Sleep Medicine (AASM). NREM sleep was divided into four stages in the Rechtschaffen and Kales (R&K) standardization of 1968. The reported differences between the REM and NREM activity are believed to arise from differences in the memory stages that occur during the two types of sleep. In addition, there is a parasympathetic dominance during NREM. The mental activity that occurs in NREM and REM sleep is a result of two different mind generators, which also explains the difference in mental activity. NREM sleep is characteristic of dreamer-initiated friendliness, compared to REM sleep where it's more aggressive, implying that NREM is in charge of simulating friendly interactions. According to studies, the mental activity that takes place during NREM sleep is believed to be thought-like, whereas REM sleep includes hallucinatory and bizarre content. People who do not go through the sleeping stages properly get stuck in NREM sleep, and because muscles are not paralyzed a person may be able to sleepwalk. Dreaming occurs during both sleep states, and muscles are not paralyzed as in REM sleep. Unlike REM sleep, there is usually little or no eye movement during these stages. There are distinct electroencephalographic and other characteristics seen in each stage. ![]() Rapid eye movement sleep (REM) is not included. Non-rapid eye movement sleep ( NREM), also known as quiescent sleep, is, collectively, sleep stages 1–3, previously known as stages 1–4. ![]() ( Learn how and when to remove this template message) ( September 2009) ( Learn how and when to remove this template message) Use the lead layout guide to ensure the section follows Wikipedia's norms and is inclusive of all essential details. The lead section of this article may need to be rewritten.
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