Nightmares are vivid, often distressing dreams that occur during sleep and typically reflect anxiety, fear, or unresolved issues. While they can feel very real while you're experiencing them, nightmares do not come true in a literal sense. They are a manifestation of your subconscious mind and do not predict actual future events.
However, some people might feel that certain themes or emotions from their nightmares can occasionally resonate with real-life situations, but this is more about personal interpretation and the way our minds process experiences rather than a predictive ability. If you find that nightmares are affecting your sleep or well-being, it may help to talk about them or seek ways to address the underlying concerns they represent.