Post-apocalyptic dreams for years

I thought about posting this here as it seems so much of my dreams are of this kind, but somehow regular dream dictionaries don't discuss these.

I have been having post apocalyptic dreams, about half the time I dream, for years now. They vary greatly but always involve one post apocalyptic world or another where small groups of unknown people have to combat some unknown danger.

There can be no very little disturbing imagery, or lots with death all around. The central premises is that I have to save these people, and most of the time I succeed. The dreams are never stressful, I'm never scared, but sometimes I do have strong feelings of compassion, joy or sadness. But they are infrequent.

They give me the sensation of, "here we go again, solving the world's problems..."

Can anyone relate?

On a sidenote; I very very rarely have real nightmares, in the past 4 years maybe 4 times.