My uncle who was dying of cancer was on morphine. A few times when the pain was bad he might get to much and halucinate. Lizards, dead loved ones, that he was young again and riding his Indian with his girl. Could be some brain damage too and his memory issues sound like that. Aother unlce was in a auto accident and all but died. Massive head injuries ect and now after 15 years he has bounced back to about a 15 yo level and has memory issues.