Causes
Nightmares can be caused by extreme stress or anxiety if no other mental disorder is discovered. The death of a loved one or a stressful life event can be enough to cause a nightmare but mental conditions like post-traumatic stress disorder and other psychiatric disorders have been known to cause nightmares as well.
If the individual is on medication, the nightmares may be attributed to some side effects of the drug. Amphetamines, antidepressants, and stimulants like cocaine can cause nightmares. Blood pressure medication, levodopa and medications for Parkinson's disease have also been known to cause nightmares as well as SSRIs like Prozac and Effexor.
Read more about this topic: Nightmare Disorder