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"REM sleep is almost like being awake, and that plays a role in why the dreams (or nightmares) that we have during that time are so much more vivid," explains Dr. Dasgupta. Explore lucid dreaming.
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 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.
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]
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.
Oneirophobia (from Greek όνειρο (oneiro), meaning "dream", and φόβος (), meaning "fear") is the fear of dreams.It is discussed in The Dream Frontier, a book by Mark Blechner, a neuro-psychoanalyst at the William Alanson White Institute.
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.