Do you ever find yourself day dreaming about death?

I ask this not as a depressed suicidal person, but I ask because today I had a long drive - 440 miles for work. As I crossed the desert and through the canyon, I found myself a bit teared up. Why? I was day dreaming about death... It was bizarre my mind went into a state where all I could do was wonder what would I do if my husband died? This question was evoked by the fact that I experienced an awake dream of him dying...then my mind just kept going ...what about my parents, siblings on and on until I got to myself. Then I asked well **** what happens if I die and how will I die and when. I guess this is a rant layered in a question in hopes I am not crazy for drifting into thoughts of death while hypnotized by the highway.