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Published on: 7/14/2026
What are the psychological and physiological causes of bad dreams?
Bad dreams, or nightmares, are often triggered by psychological factors such as stress, anxiety, and trauma, including early childhood experiences. Hormonal and emotional changes during adolescence can also increase how often nightmares occur. Post-traumatic stress disorder (PTSD), depression, and unresolved emotional distress are common contributors to recurring bad dreams in both children and adults.
If nightmares are disrupting your sleep or daily life, understanding the underlying cause is the first step toward relief. Taking a free, instant, online symptom check can help you identify possible triggers, assess whether an underlying condition may be involved, and guide you on the best next steps—whether that's self-care strategies or speaking with a healthcare professional.
Reviewed for medical accuracy: 07/14/2026
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Bad dreams, or nightmares, can happen for several reasons. Psychological causes include trauma and stress. For example, after a traumatic event, people might have nightmares as a way for the brain to process what happened. This is discussed in the study by Hartmann, which suggests that nightmares after trauma can be a model for understanding all dreams.
Physiological causes can include changes that occur during adolescence. As teens grow, their bodies and minds go through many changes, and this can lead to more disturbing dreams, as noted in the research by Nielsen and colleagues.
Early experiences, such as abuse, can also lead to nightmares later in life. The study by Arvanitakis and others shows that people who experienced early abuse might have more nightmares as adults.
If you're experiencing concerning symptoms related to sleep disturbances or mental health, take our free AI symptom checker to better understand what might be affecting your well-being.
(References)
Hartmann E. (1998). Nightmare after trauma as paradigm for all dreams. Psychiatry, 9823032.
Nielsen TA, Laberge L, Paquet J, Tremblay RE, Vitaro F, & Montplaisir J. (2000). Development of disturbing dreams during adolescence .... Sleep, 11007439.
Arvanitakis K, Jodoin RM, Lester EP, Lussier A, & Robertson BM. (1993). Early sexual abuse and nightmares in the analysis of adults. The Psychoanalytic quarterly, 8284332.
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