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Nightmare disorder is a sleep disorder characterized by repeated intense nightmares that most often center on threats to physical safety and security. [2] The nightmares usually occur during the REM stage of sleep, and the person who experiences the nightmares typically remembers them well upon waking. [2]
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.
"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.
Nightmares do have some real benefits for the people who thrash and sweat their way through them, scientists say.
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 ...
Experts think there is growing evidence that regular bad dreams could be an early warning sign for developing the condition. Frequent bad dreams and nightmares linked to Parkinson’s in new study ...
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 ...
In Catalonia legend and popular culture, the Pesanta is an enormous dog (or sometimes a cat) that goes into people's houses in the night and puts itself on their chests making it difficult for them to breathe and causing them the most horrible nightmares. The Pesanta is black and hairy, with steel paws, but with holes so it cannot take anything.