My father has been developing dementia for some time, but over the last year he has gotten much worse. I was in denial until recently and looking back he has been forgetful and having to leave notes all over his house for a few years. He has over the last year had a rapid decline and his short term memory is all but gone. He doesn't understand complicated matters or much of what you are trying to explain to him in general. He can forget things in a matter of seconds , but other things he may remember for days. Its so hard to understand how this disease works. He also doesn't sleep well at night and has started having violent nightmares. Has anyone else noticed their loved one having these issues? My father had uncontrolled diabetes and has severe COPD that the Doctors think caused his dementia. He also has a family history of alzheimers. He seems to be getting worse and knows he has something wrong and doesn't want to live like this anymore. Its been a very rapid decline this year for him. I know that its impossible to predict and there are certain stages of the disease, but does anyone have any idea how rapid this can progress and how long of a life the patient may have left?