Lewy Body Dementia: Understanding Changes in Alertness, Movement, and Sleep

“My mother seemed clear this morning. By afternoon, she could barely follow our conversation.”

Changes like these can be confusing for families. Lewy body dementia can affect thinking, movement, behavior, and sleep, and it may resemble both Alzheimer’s and Parkinson’s disease. It is associated with abnormal deposits of a protein called alpha-synuclein in the brain.

Which symptoms matter?

Features can include pronounced fluctuations in attention and alertness, visual hallucinations, stiffness or slowed movement, and acting out dreams during sleep. Memory loss may be less prominent early on than families expect. These symptoms warrant professional evaluation; they do not establish a diagnosis by themselves.

Keep a simple record of what happens and when. Include sleep changes, falls, hallucinations, and differences in alertness. This gives the clinician a fuller picture than “some days are worse.”

Why does the diagnosis affect medication decisions?

People with Lewy body dementia may have severe reactions to certain antipsychotic medicines, including worsening confusion, movement problems, and heavy sedation. Make sure emergency staff and other clinicians know about a confirmed or suspected diagnosis before prescribing medication.

There is currently no cure, but individualized treatment can help manage symptoms. Care may include medication, physical therapy, occupational therapy, and support for sleep and daily activities.

For caregivers, flexibility matters. Plan to demand tasks during more alert periods, simplify the environment, and respond calmly when your parent feels frightened.

A difficult afternoon does not erase a meaningful morning. Meet your parent where they are today—and make room for support for yourself, too.