Is this signs of dementia night restlessness, continued talking or arguing to self, quickly agitated?

it could be a number of things. you would need to be more specific. Are you forgetting things that normal people don't forget? like forgetting how to count money, or forgetting where you live? forgetting the name of something even if it is right in front of you. or forgetting how to walk? those are the major signs of dementia.. the other things you describe if those are your only signs.. sound more like stress to me... and when i'm supppper stressed i argue with myself all the time. can't sleep and am very easy to get offended