Dec 18, 2016 - 11:46 AM
Short answer is Yes.
The word "dementia" is a general word that describes the strange, bizarre, forgetful type of behaviors. There are 75 different known causes of dementia. Alzheimer’s disease of course, but medications and even the lack of sleep can all produce symptoms of 'dementia'.
With so many causes it is easy to understand how the symptoms can come and go and YES people will have both good and bad days. Even in people who have a diagnosis that stems from a deep organic cause (such as Alzheimer’s Disease) will have periods where the behaviors (symptoms) come & go or seem to stabilize for a while.
The diagnosis of 'dementia' is about as valuable as a doctor giving you a diagnosis of 'cancer'. "OK, doctor, you say I have cancer, but is it skin?, or breast? or aggressive pancreatic cancer?" The treatments and prognosis are very different for each type. If you had cancer, you would want to know the exact type you have and you would demand that your doctor explain to you exactly what you have.
You definitely need to work with your father's doctor and hone in on a better root cause of his unusual behaviors. Then research all you can about that specific type of dementia and become better acquainted with the various behaviors and the general progress of that specific disease.