What are the different types of bad dreams and their causes?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Bad dreams, including nightmares, are vivid, disturbing dreams that often wake you up feeling scared, anxious, or unsettled. The most common causes include stress, anxiety, trauma, and emotional experiences from daily life. However, frequent bad dreams may also signal an underlying sleep disorder such as nightmare disorder, sleep apnea, or REM sleep behavior disorder. Certain medications, alcohol, poor sleep habits, and mental health conditions like PTSD or depression can also trigger them.

Because bad dreams can stem from many different causes—some minor, others requiring medical attention—it's important to identify what's driving yours. Understanding the root cause is the first step toward better sleep and peace of mind. Take a free, instant, online symptom check to get personalized insight into your symptoms and clear guidance on your next steps.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Learn what may be causing bad dreams Find out if your bad dreams are serious Discover whether nightmares need medical care See OTC options for sleep disturbance relief Find a doctor for sleep concerns Understand medically valid home remedies for nightmares Check if bad dreams signal something else

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Explanation

Bad dreams can take different forms, including nightmares, which are scary dreams that wake you up. Nightmares can be caused by anxiety or stress, and sometimes they are part of a sleep disorder. People often feel strong emotions during nightmares, like fear or sadness.

Types of Bad Dreams:

Nightmares: These are vivid and scary dreams that can wake you up and leave you feeling upset.
Bad Dreams: These are similar to nightmares but might not wake you up. They can still make you feel uneasy.

Causes of Bad Dreams:

Anxiety and Stress: Feeling worried or stressed can lead to more bad dreams.
Emotional Experiences: Strong feelings during the day can affect your dreams at night.
Sleep Disorders: Sometimes, bad dreams are part of a sleep disorder that needs attention.

If bad dreams are bothering you or affecting your sleep, you can take our free symptom checker to better understand what might be causing your sleep disturbances and get personalized guidance on next steps.

(References)

Spoormaker VI, Schredl M, & van den Bout J. (2006). Nightmares: from anxiety symptom to sleep disorder. Sleep medicine reviews, 16377217.
Zadra A, Pilon M, & Donderi DC. (2006). Variety and intensity of emotions in nightmares and bad .... The Journal of nervous and mental disease, 16614545.
Abdul-Razzak KK, & Alkhatatbeh MJ. (2021). Nightmares and bad dreams among individuals with .... Research in psychotherapy (Milano), 34568104.

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