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The nightmares usually occur during the REM stage of sleep, and the person who experiences the nightmares typically remembers them well upon waking. [2] More specifically, nightmare disorder is a type of parasomnia , a subset of sleep disorders categorized by abnormal movement or behavior or verbal actions during sleep or shortly before or after.
In addition, nightmares appear ordinarily during REM sleep in contrast to night terrors, which occur in NREM sleep. [2] Finally, individuals with nightmares can wake up completely and easily and have clear and detailed memories of their dreams. [2] [30] A distinction between night terrors and epileptic seizure is required. [30]
In the nineteenth century, authors believed that nightmares were caused by not having enough oxygen, therefore it was believed that those with sleep apnea had more frequent nightmares than those without it. The results actually showed that healthy people have more nightmares than sleep apnea patients. [15] Another study supports the hypothesis.
Nightmares do have some real benefits for the people who thrash and sweat their way through them, scientists say.
A 2004 study found people who slept on their left side had more nightmares. The research found about 41 percent of left-side sleepers had nightmares, compared to 14.6 percent of right-side sleepers.
Unfortunately, nightmares are the dreams you are more likely to remember. When you eat, your metabolism revs up to digest the food, and in turn causes your body temperature to rise.
This helplessness can intensify the effects of the threat response well above the level typical of normal dreams, which could explain why such visions during sleep paralysis are so vivid. The threat-activated vigilance system is a protective mechanism that differentiates between dangerous situations and determines whether the fear response is ...
Most individuals, when woken by a disturbing dream, would label it as a nightmare; but dream classification is not that simple. Anxiety dreams, punishment dreams, nightmares, post-trauma dreams, and night terrors are difficult to distinguish because they are commonly clumped under the term "nightmare". The different types of dreams, however ...
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