HealthEssentials: A National Center for Health Statistics report found the number of adults taking melatonin more than doubled between 2007 and 2012.

In general, you might have more vivid dreams if you’re anxious or stressed. Certain sleep disorders, such as obstructive sleep apnea, and taking medications such as beta blockers and antihistamines, can also lead to an increase in vivid dreams and/or nightmares.

However, according to Dr. Drerup, it’s unclear if taking extra melatonin before going to bed causes bad or vivid dreams. “There’s no conclusive evidence as to how exactly your dreams are affected by taking melatonin supplements,” she says.

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