Why do people get nightmares? Plus, 10 ways to treat them

Waking up in a cold sweat, heart pounding, from a vivid and terrifying dream is an experience most people know well. Nightmares are among the most disruptive sleep disturbances — and for some people, they're a nightly occurrence. Here's why they happen and what you can do about them.

What are nightmares?

Nightmares are vivid, disturbing dreams that typically occur during REM (rapid eye movement) sleep, which is most abundant in the second half of the night. Unlike sleep terrors — which occur during non-REM sleep and leave no memory — nightmares are usually remembered in detail upon waking and can cause significant emotional distress.

Why do people get nightmares?

Nightmares can be triggered by a wide range of factors:

• Stress and anxiety: The most common trigger. Daytime worries are processed during REM sleep and can manifest as threatening dream scenarios
• Trauma: Post-traumatic stress disorder (PTSD) is strongly associated with recurrent nightmares, often replaying traumatic events
• Medications: Beta-blockers, antidepressants, blood pressure medications, and some sleep aids can increase nightmare frequency
• Alcohol and substance use: Alcohol suppresses REM sleep initially, then causes REM rebound — intense, vivid dreaming — as it wears off
• Sleep deprivation: Insufficient sleep leads to REM rebound, increasing nightmare intensity and frequency
• Eating before bed: Late meals raise metabolism and body temperature, potentially stimulating more vivid dreams
• Underlying sleep disorders: Sleep apnea and REM sleep behavior disorder are associated with disturbing dreams

10 ways to treat and reduce nightmares

1. Address stress and anxiety

Since stress is the leading trigger, managing it during the day is the most powerful intervention. Regular exercise, mindfulness meditation, journaling, and therapy can all reduce the emotional load that fuels nightmares.

2. Try Image Rehearsal Therapy (IRT)

IRT is the most evidence-based treatment for recurrent nightmares, particularly those related to PTSD. It involves writing down a recurring nightmare, then rewriting it with a different, less threatening ending — and rehearsing the new version mentally during the day. Over time, this can change the nightmare's content.

3. Establish a calming bedtime routine

Wind down with relaxing activities in the hour before bed — reading, gentle stretching, or a warm bath. Avoid stimulating content like action movies, news, or stressful conversations close to bedtime.

4. Limit alcohol, especially in the evening

Cutting off alcohol at least 3–4 hours before bed reduces REM rebound and the vivid, disturbing dreams that accompany it.

5. Review your medications

If nightmares began after starting a new medication, speak with your doctor. Adjusting the dose or timing may help without compromising the medication's effectiveness.

6. Keep a dream journal

Recording your dreams immediately upon waking can help identify patterns and triggers. It also externalizes the experience, reducing its emotional power over time.

7. Practice lucid dreaming techniques

Lucid dreaming — becoming aware that you're dreaming while still in the dream — can give you the ability to change or exit a nightmare. Reality testing during the day (asking yourself "am I dreaming?") can increase lucid dreaming frequency.

8. Optimize your sleep environment

A cool, dark, quiet bedroom promotes deeper, more restorative sleep and can reduce the frequency of disturbing dreams. Comfortable, breathable bedding also helps maintain the stable body temperature that supports healthy REM sleep.

9. Treat underlying sleep disorders

If sleep apnea or another sleep disorder is contributing to nightmares, treating the underlying condition often resolves the nightmares as well. A sleep study can identify these issues.

10. Seek professional help for trauma-related nightmares

If nightmares are related to trauma or PTSD, working with a therapist trained in trauma-focused cognitive behavioral therapy (TF-CBT) or EMDR (Eye Movement Desensitization and Reprocessing) can be transformative. These are not issues to manage alone.

The bottom line

Occasional nightmares are a normal part of human sleep. But frequent, distressing nightmares that affect your quality of life are treatable — and you don't have to simply endure them. Start with stress management and sleep hygiene, and seek professional support if nightmares are persistent or trauma-related.

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