is it related to movements during sleep as well?
Yes
Dementia with Lewy bodies
REM sleep behavior disorder (RBD) is a parasomnia in which individuals lose the paralysis of muscles (atonia) that is normal during rapid eye movement (REM) sleep, and consequently act out their dreams or make other abnormal movements or vocalizations. 
how did lewy body dementia get its name Kenji Kosaka what is this dementia? A type of dementia accompanied by changes in sleep, behavior, cognition, movement, and autonomic bodily functions how is it classified? It is one of the two Lewy body dementias, along with Parkinson's disease dementia how is it diagonosed? Diagnosis of the living is referred to as "probable" or "possible" because of the wide range of symptoms with differing levels of severity in each individual how does this disease affect the society? UNANSWERABLE what medicines are prescribed for treating this? Pharmacological management of DLB is complex because of adverse effects to medications does it affect sleep? Yes, have REM sleep behavior disorder (RBD)
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Dementia with Lewy bodies [SEP] REM sleep behavior disorder
REM sleep behavior disorder (RBD) is a parasomnia in which individuals lose the paralysis of muscles (atonia) that is normal during rapid eye movement (REM) sleep, and consequently act out their dreams or make other abnormal movements or vocalizations. About 80% of those with DLB have RBD. Abnormal sleep behaviors may begin before cognitive decline is observed, and may appear decades before any other symptoms, often as the first clinical indication of DLB and an early sign of a synucleinopathy. On autopsy, 94 to 98% of individuals with polysomnography-confirmed RBD have a synucleinopathy—most commonly DLB or Parkinson's disease in about equal proportions.