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Though you can have dreams during NREM sleep, it’s likelier for more interesting and in-depth dreams to occur during REM sleep. There are a few key things that happen to your body during this phase.
Dreaming and sleep are intertwined. Dreams occur mainly in the rapid-eye movement (REM) stage of sleep—when brain activity is high and resembles that of being awake. Because REM sleep is detectable in many species, and because research suggests that all mammals experience REM, [15] linking dreams to REM sleep has led to conjectures that ...
While fast asleep, some people experience new narratives beyond their waking life. ... REM sleep is when many dreams occur, and if you get a full night’s sleep, you should have entered REM sleep ...
Although study participants' reports of intense dream vividness during REM sleep and increased recollection of dreams occurring during that phase suggest that dreaming most commonly occurs during that stage, [12] dreaming can also occur during NREM sleep, [12] in which dreams tend to be more mundane in comparison. [13]
The evidence of the involvement of mesolimbic and mesocortical dopaminergic pathways suggests that dreaming occurs when a motivational component is activated. Only when this pathway is removed do dreams cease to occur. This system can be activated by mechanisms of REM sleep but can also occur independently during NREM stages of sleep.
Deep sleep stages III and IV all occur during the first half of the night, while lighter stages I and II occur during the later half. During standard sleep laboratory measurements, the states of sleep and waking have behavioral , polygraphic, and psychological manifestation within the pontine brainstem.
In fact these could be considered a hybrid state combining essential elements of REM sleep and waking consciousness.) [16] The mental events which occur during REM most commonly have dream hallmarks including narrative structure, convincingness (e.g., experiential resemblance to waking life), and incorporation of instinctual themes. [16]
During normal sleep cycles, humans alternate between normal, NREM sleep and REM sleep. The brain waves characteristic of dreaming that are observed during REM sleep are the most commonly studied in dream research because most dreaming occurs during REM sleep. [1]