Lewy body dementia also known as dementia with lewy bodies is the second most common type of progressive dementia after alzheimers disease dementia protein deposits called lewy bodies develop in nerve cells in the brain regions involved in thinking memory and movement motor control. Dementia with lewy bodies dlb is a type of dementia accompanied by changes in sleep behavior cognition movement and autonomic bodily functionsmemory loss is not always an early symptom the disease worsens over time and is usually diagnosed when cognitive decline interferes with normal daily functioningtogether with parkinsons disease dementia dlb is one of the two lewy body dementias. Lewy body dementia lbd is a disease associated with abnormal deposits of a protein called alpha synuclein in the brain these deposits called lewy bodies affect chemicals in the brain whose changes in turn can lead to problems with thinking movement behavior and mood lewy body dementia is one of the most common causes of dementia. Lewy body dementia is a progressive complex and challenging condition which is thought to account for 10 15 of all those with dementia in the early stages it is often mistaken for alzheimers disease and can be diagnosed wrongly lewy body dementia includes two subtypes dementia with lewy bodies and parkinsons disease dementia it particularly affects the persons ability to think and move and can cause hallucinations fluctuations in alertness and sleep disturbances which can be