Can anyone please tell me if this is a common trait with Vascular Dementia. My partner, diagnosed nearly 4 years ago, has good days and bad days, but the bad days are very bad and when he has good days he appears almost normal. During the bad days he is seriously confused and delusional all day and then the very next day he is capable of clear reasoning and understanding, and almost his pre-dementia self. I never know which character is going to present itself each morning and how to contend with such extreme variation in his behaviour.