Terror in a dream may represent fear or horror during your rest period. It’s assumed that someone is missing out on something or fearful of something close, but has not been awakened even with all their body screaming for it earlier. They may be too scared to move much when their body finally does wake up.
Knowing that a horrendous attack is about to take place and there’s no way you can stop the tragedy, you dream about the terror and the worst possible outcome.
You obviously cannot prevent yourself from dreaming of terrorizing events but there are ways to minimize their effect on your mental wellbeing. These include maintaining a journal to keep track of how many times you conceived these dark thoughts, share it with loved ones in order for them to help instead of reject you and learn how not to think about problematic thoughts in order for these disturbing dreams not to resurface as often.