"A nightmare is a dream that can cause a strong negative emotional response from the sleeper, typically fear and/or horror. The dream may contain situations of danger, discomfort, psychological or physical terror. Sufferers usually awaken in a state of distress and may be unable to return to sleep for a prolonged period of time." I just woke up from the most horrible nightmare i've had in years. I feel horrible, my mood is very low, I feel really bad.
