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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.
Disrupted sleep and sleep loss interferes with the brain's ability to filter out bad memories, which could contribute to a range of mental health conditions, such as anxiety, depression, and post ...
Nightmares do have some real benefits for the people who thrash and sweat their way through them, scientists say.
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.
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Research by Harvard psychologist Deirdre Barrett has found that people who experience vivid dreamlike mental images reserve the word for these, whereas many other people refer to milder imagery, realistic future planning, review of memories or just "spacing out"—i.e. one's mind going relatively blank—when they talk about "daydreaming".
Not all people have the same mental imagery ability. For many, when the eyes are closed, the perception of darkness prevails. However, some people are able to perceive colorful, dynamic imagery (McKellar, 1957). The use of hallucinogenic drugs increases the subject's ability to consciously access mental imagery including synaestesia (McKellar ...
Sleep paralysis is a state, during waking up or falling asleep, in which a person is conscious but in a complete state of full-body paralysis. [1] [2] During an episode, the person may hallucinate (hear, feel, or see things that are not there), which often results in fear.