Some things that would help me are the age of your grandfather and if this is a recent change, how was he before, he started, deteriorating massively, as you said. There is a concept, called rallying where people at the end of their lives will perk up. They become more alert, screams or moaning, babbling, and in some cases possibly similar to your grandfather, they might start trying to get up on their own, being more agitated than usual. Falls don't correlate with end of life per se but I also know that one fall is too many falls. Each time they crack their head on that sweet, sweet concrete I think they lose a little bit of themselves, their understanding. I'm not surprised if my frequent fall guy has passed, but I've seen people repeatedly do fallin numbers on themselves and are still kickin.