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They have also been referred to as veridical hallucinations, visions of the dying and predeath visions. [1] The physician William Barrett, author of the book Death-Bed Visions (1926), collected anecdotes of people who had claimed to have experienced visions of deceased friends and relatives, the sound of music and other deathbed phenomena. [8]
Up to 80% of people with DLB have visual hallucinations, typically early in the course of the disease. [ 25 ] [ 59 ] They are recurrent and frequent; may be scenic, elaborate and detailed; [ 60 ] and usually involve animated perceptions of animals or people, including children and family members. [ 5 ]
Studies show that visual hallucinations are present in 16%–72% of patients with schizophrenia and schizoaffective disorder. [5] [23] [16] [14] In delirium, visual hallucinations have been observed in 27% of patients. [14] [13] Furthermore, visual hallucinations are reported in over 20% of individuals with dementia with Lewy bodies. [14] [24]
The researchers looked at 181 potential risk factors, and then estimated how likely they are to predict dementia and cognitive impairment for people two, four, and 20 years after they turn 60.
This isn’t the first time that better sleep has been linked with a lower risk of dementia: A study published in October even found that people with sleep apnea are more likely to develop dementia.
As time passes from the initial onset of visual hallucinations, studies show that around 60% of those living with CBS feel that visual hallucinations have no effect on their lives, 33% of people feel that the hallucinations are disruptive to their lives, and 7% of people even find pleasure in the hallucinations. [6]
Check for over-napping. People may wish to take naps during the day, but unintentionally getting too much sleep will affect nighttime sleep. Physical activity is a treatment for Alzheimer's and a way to encourage night sleep. [5] Caffeine is a (fast-working) brain stimulant, but should be limited at night if a night's sleep is needed. [4] [5] [10]
Hypnagogic hallucinations are often auditory or have an auditory component. Like the visuals, hypnagogic sounds vary in intensity from faint impressions to loud noises, like knocking and crashes and bangs (exploding head syndrome). People may imagine their own name called, crumpling bags, white noise, or a doorbell ringing.