First things first.. What are they?
Back centuries ago, nightmares were often thought of as evil spirits, often ones intending to bring harm or chaos into someone’s life. In the old English version, it was something of a mythological demon or spirit who torments others with horrible dreams. Over time, this idea has changed. For the better at that, as now it’s seen as a common thing that results from the subconscious which can come from phobias, traumatic events, or even just out of deep-rooted issues that you’ve had in life.
Sadly, horrifying and heartbreaking things happen to everyone almost on a daily basis. Some are more traumatic than others, but all can leave some burden on your mind. Nightmares feed on those memories, even small pieces of it. Therefore, these are often engrained in the subconscious, even long after you’ve gotten over it. PTSD-fueled nightmares are a prime example of this, as they are recurring memories of a incident that inflict stress and trauma to the person
There are numerous factors that can cause nightmares, and while we can’t list them all, here are some of a few: High blood pressure, antidepressants, and blood pressure medication, all of which mess with the brain in some way or fashion. There are many others, but these are a basic few.
These can cause sleep deprivation, stress, and irritability that results from the formerly mentioned thing. Sleep deprivation can also decrease your motor skills and productivity, meaning that you won’t be able to put forth your best effort as a result.
How to Prevent Them
While there is no certain way to prevent nightmares for everyone, there are steps you can take individually to prevent then. Things such as getting a relaxing routine going before bed, talking about the dream after you’ve had it, and using a nightlight can all be helpful in those situations.
However, as a final note, for PSTD fueled nightmares, you can take some forms of treatment for them to help. These are Prazosin and Clonidine, from what I’ve read.