Why do traumatic experiences lead to nightmares?

Some times these can be vary traumatizing to the brain and heart . Some times these things can`t be erased from the mind and the heart and its not easy . This is my view of why night mares happen

Its a scary situation and the mind held onto it. PTSD does stuff to the mind. Its something thats not really understood, unless you have experienced such experiences that are just scary to you.

because you haven't moved on. once you come to terms with your circumstance moving on is easier and eventually makes you stronger.

We (science!) don't really know a lot about nightmares, and the way that the brain processes trauma is super complicated. What we do know though is that this happens during REM sleep (rapid eye movement). During this time, our brain processes a massive amount of information - everything from memories, things that we've experienced, new sensations, feelings that we've had during the day etc etc. It's believed that a lot of this stuff is subconscious (not things we're aware of). When we have traumatic experiences, our brain is constantly processing it and trying to make sense of it. Our brains both want to understand it, make us feel safe and learn about trauma so that we can function in everyday life. Even though they can be super scary, when we start to process that trauma (like through therapy), you'll find that you do get less over time.

I think that night dreams are about what we fear or what we like: brain may also try to find solutions to what sounds to be a "no way out" when we are awake. If during daily life something triggers us then here there are nightmares. To try to focus on what we feel during/after nightmares, maybe can help understanding if we are still fighting with some fears or any other emotion. There are also different kind of traumas: some may require professional help, more when we see they impact on our daily life than for the nightmares themself. The nightmare can also tell us about something we haven't yet overcome but we would tend to avoid/hide when we are awake. It's like to have to deal with our subconscious that is linked to our inside and needs to be heard too. To consider nightmares and try to track when and why they happen may help us to be aware if there is something we need to pay attention to, in order to have a better life after traumatic experiences.