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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. [1] [3] Episodes generally last no more than a few minutes. [2]
Oneirophrenia was studied in the 1950s by the neurologist and psychiatrist Ladislas J. Meduna (1896–1964), also known as the discoverer of one of the forms of shock therapy, using the drug metrazol. Although oneirophrenia was recognized as a specific condition in the 1950s, it was not studied in depth until the 1960s.
Sleep paralysis is associated with sleep-related hallucinations. [22] Predisposing factors for the development of recurrent isolated sleep paralysis are sleep deprivation, an irregular sleep-wake cycle, e.g. caused by shift work, or stress. [22] A possible cause could be the prolongation of REM sleep muscle atonia upon awakening. [34]
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 January 2025. The following is a list of mental disorders as defined at any point by the Diagnostic and Statistical Manual of Mental Disorders (DSM) or the International Classification of Diseases (ICD). A mental disorder, also known as a mental illness, mental health condition, or psychiatric ...
Narcolepsy is a chronic neurological disorder that impairs the ability to regulate sleep–wake cycles, and specifically impacts REM (rapid eye movement) sleep. [1] The pentad symptoms of narcolepsy include excessive daytime sleepiness (EDS), sleep-related hallucinations, sleep paralysis, disturbed nocturnal sleep (DNS), and cataplexy. [1]
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This is a list of major and frequently observed neurological disorders (e.g., Alzheimer's disease), symptoms (e.g., back pain), signs (e.g., aphasia) and syndromes (e.g., Aicardi syndrome). There is disagreement over the definitions and criteria used to delineate various disorders and whether some of these conditions should be classified as ...
But in people with dementia—which is an umbrella term for mental decline and can be related to a number of diseases such as Alzheimer's—there’s a phenomenon known as “sundowning,” where ...