To dream that you or somebody has Dementia infers that there is a waking circumstance that is making you "lose your brain." Perhaps somebody or some circumstance is actually making you insane. On the other hand, the fantasy might be intelligent of somebody in your cognizant existence who is experiencing dementia."

To dream that you or someone has dementia implies that there is a waking situation that is causing you to "lose your mind." Perhaps someone or some situation is literally driving you crazy. Alternatively, the dream may be reflective of someone in your waking life who is suffering from dementia.