“Mad as a hatter” In 18th and 19th century England, mercury was used in the production of felt, which was used in the manufacturing of hats common of the time. People who worked in these hat factories were exposed daily to trace amounts of the metal, which accumulated within their bodies over time, causing some workers to develop dementia caused by mercury poisoning. Thus the phrase “Mad as a Hatter” became popular as a way to refer to someone who was perceived as insane.
Dementia is a blanket or umbrella term that characterizes one of the primary clinical manifestations of several diseases or conditions; including Alzheimer's disease (AD), Parkinson's disease (PD) in the late stages, vascular dementia (VaD), Fronto-temporal dementia (FTD), & Dementia with Lewy bodies (DLB).
SUNDOWNING occurs most often in the middle stages of Alzheimer’s/other dementias. Studies estimate up to 20 % of persons with Alzheimer's/other dementias will experience increased confusion, anxiety & agitation as the day ends (sun sets). Others may experience changes in their sleep schedule & restlessness during the night. These disruptions in the sleep-wake cycle often lead to more behavioral problems causing a serious challenge for families. ~ Lori
Alzheimer's Disease and Personality Changes - What you can do