@Roiisu My grandma developed cancer and was quickly bedridden. She spent months in terrible pain, barely lucid, and unable to move. She only left the bed to use the bathroom, which I had to help her do. One day, she was just magically better. Totally lucid, without pain, and full of energy. It was like we went back in time to be before she had cancer! She got dressed and made me take her out to a salon, to eat, to go shopping, and more. We spent the whole day together and it was like she never even had cancer to begin with. When she went to bed that night, she didn't wake up. She passed away. That was her last day of life.
I had a similar although less extreme experience with my grandpa and I've been told by a doctor that this is sort of common. Not being a doctor, however, I obviously don't know much about it.