Even if you can't always remember your dreams, research suggests we all have them. But sometimes our dreams can turn into nightmares. While most people experience the occasional nightmare, about 4% of US adults suffer from nightmare disorder, research published in the Journal of Clinical Sleep Medicine found. This condition causes frequent bad dreams that wreak havoc on a person's sleep and daily life.

In this article, sleep experts, including STRONG STAR invesigator Kristi Pruiksma, PhD, of The University of Texas Health Science Center at San Antonio, explain nightmare causes and treatments.