Later as the disease progressed Milly's world became smaller and smaller. The outside enviroment became less and less of her world and she would talk to unseen people. These seemed to be people and memories that lived yet inside her head. Our world had less and less impact on her. Acknowledging that we were even her became an infrequent event.
Some medications can build up in the blood system over a period of time and cause hallucinations.
Many times illness can cause an increase in confussion and halucinations. Also things like cold medications can also have a negative effect on the Loved Ones mental state. Many times though a cause or reason can be found for them in the enviroment or decline in the disease. Milly use to see men in her room and about the house. The man in her room and some other locations proved to be her reflection in the mirror.