What a thoughtful piece.
I often think: "What if, when I get up tomorrow I find out that she or he has died in the night?" Then - should I have said or done something to or for that person before they died?
If so, I need to do or say those things now.
Also, I imagine being hit by a bus - what might I regret while I'm lying there with a bus crushing me? Those things need to be dealt with now.
I've got into this habit because from childhood people have died. They didn't wait until I was older. So I want to make sure I don't let anyone down.