Imagine finally drifting off to sleep after a long day, only to be startled awake by a shadowy presence. Was it a dream or reality? Sleep is vital for the body, but an irregular sleep schedule can lead to sleep disorders that feel like nightmares.

From sleepwalking to night terrors, explore some of the most frightening sleep disorders.

Note: This content is not a replacement for professional medical advice, diagnosis, or treatment. Always consult your physician or a qualified health provider with any health-related questions. In case of an emergency, contact your doctor or emergency services immediately. Use the information at your own risk.