Hey Pandas, What Is Something That Gives You Nightmares?

Doesn't happen very often that I have nightmares, like once every 5-6 months, but it is ALWAYS the exact same one, never anything else. Looking out the window, sky is dark orange, seeing a mushroom cloud from a nuclear explosion. And then, the 2 minutes that passes with the notion of being powerless, knowing what's coming, and still trying to scurry for protection for nothing. >< Big oof.