A few months ago, I endured two weeks of having this kind of nightmare over-and-over again.
This is a basic description of my dream, pulled from my dream journal.
It would start with me in my normal environment, usually sitting with my mother and her caregiver in our apartment, we're watching TV, then an alert comes on over the TV and on our phones, it was a national alert warning of an invasion affecting almost every state on both the East and West coasts. Then, after the alert, the power would go out and I'd start hearing the high-pitched hum of jets outside. Then I'd hear explosions and people screaming outside. Around this time in the dream, I'd run outside only to see planes flying overhead with soldiers jumping out of them, parachuting to the ground.
The dreams always ended with us being killed by the soldiers, each with no personal traits, their faces covered by masks.