In this stage, patients can no longer function alone. Stage three Patients are completely dependent on others for their care. Aside from the mental deterioration, patients' physical condition may begin to degenerate. Patients are disorientated and can no longer find their own way around. They develop sleeping problems and may start wandering at night.
Patients become incontinent and have problems with walking, sitting and eating.
They eventually lose ability to chew and swallow, and there is greater vulnerability to infections and other diseases. This stage eventually leads to death.