According to a 2024 systematic review in the Journal of Sleep Research (Dumont et al.), researchers identified 73 different medications linked to drug-induced parasomnias, with nightmares, REM sleep behavior disorder, and sleepwalking as the most common outcomes. If you’ve been trying to figure out why you or someone you love walks, talks, or thrashes around during sleep, you’re not alone, and you’re asking a genuinely reasonable question. This guide walks through the most common parasomnia causes, from everyday lifestyle factors to underlying health conditions, so you can start connecting the dots.
Understanding what causes parasomnia can feel like piecing together a puzzle, especially because there’s rarely one single answer. Sometimes it’s a stressful week of poor sleep. Sometimes it’s something written into your genes. And sometimes it points to a medication or a mental health condition that deserves a closer look. This article breaks each of these possibilities down so you can better understand your own experience, or a loved one’s.
What Causes Parasomnia?
Parasomnia causes generally fall into a few overlapping categories, and most people who experience these episodes have more than one contributing factor at play.
Major categories behind parasomnia causes include:
- Sleep deprivation – not getting enough total sleep
- Stress and anxiety – emotional tension that disrupts normal sleep transitions
- Genetics – a family history of sleepwalking or related behaviors
- Medications – certain antidepressants, sedatives, and sleep aids
- Underlying sleep or mental health disorders – conditions that fragment or destabilize sleep
A cross-sectional study of psychiatric outpatients found that parasomnias were notably more common among people already managing a mental illness, which reinforces just how tightly sleep and mental health are connected.
How Does Sleep Deprivation Trigger Parasomnia?
Sleep deprivation triggers parasomnia by increasing what’s called deep-sleep rebound. When you’re chronically sleep deprived, your brain compensates by spending more time in deep, slow-wave sleep once you finally do sleep, and this is exactly the stage where sleepwalking and night terrors originate. Essentially, your brain is trying to “catch up,” but that catch-up process makes the transitions between sleep stages messier and less stable. This is one reason people notice more parasomnia episodes during especially exhausting or high-stress weeks.
Can Genetics Cause Parasomnia?
Yes, genetics is one of the most well-documented parasomnia causes, particularly for sleepwalking. Twin and family studies have consistently shown that if a parent sleepwalked as a child, their children are significantly more likely to as well. This doesn’t mean genetics acts alone, but it does mean some people’s brains are simply more prone to getting “stuck” between sleep stages than others.
What Causes Parasomnia in Adults?
What causes parasomnia in adults often looks a bit different from what triggers it in children, since adult life adds layers like alcohol use, irregular schedules, and long-term medication use.
Common adult-specific triggers include:
- Alcohol – disrupts normal sleep architecture, especially in the second half of the night
- Chronic stress – ongoing work or life pressure that never fully resolves
- Irregular schedules – shift work, jet lag, or inconsistent bedtimes
- Medications – particularly certain antidepressants and sedative-hypnotics
- Underlying medical or psychiatric conditions – conditions that weren’t present, or weren’t diagnosed, in childhood
Are Adult Parasomnias Different from Childhood Ones?
In many ways, yes. Childhood parasomnias, like sleepwalking and sleep terrors, are usually tied to a still-developing nervous system and tend to resolve with age. Adult-onset parasomnias, on the other hand, are more likely to be linked to a specific trigger, whether that’s a new medication, a mental health condition, or another sleep disorder, which is why new symptoms appearing for the first time in adulthood are worth mentioning to a provider.
Can Certain Medications Cause Parasomnia?
Absolutely, and this is one of the clearest, most well-researched parasomnia causes. Nearly all SSRIs have been associated with parasomnia-like symptoms, including vivid dreams, nightmares, and, in some cases, sleep paralysis or REM sleep behavior disorder. For example, someone who recently started an antidepressant might notice unusually vivid or disturbing dreams within the first few weeks, a known and fairly common side effect that’s worth discussing with a prescriber rather than stopping medication abruptly.
What Underlying Health Conditions Are Linked to Parasomnia?
Beyond lifestyle and genetics, several underlying health conditions are consistently linked to parasomnia, particularly conditions that affect mental health or fragment normal sleep architecture.
Can Mental Health Conditions Cause Parasomnia?
Yes, mental health conditions are among the most significant parasomnia causes, especially anxiety, depression, and PTSD. Nightmares and sleep terrors are particularly common among people with PTSD, since the same heightened arousal system involved in trauma responses also disrupts normal REM sleep. If you’re already managing a mental health condition and noticing more frequent parasomnia episodes, the two are very likely connected.
Is Parasomnia Linked to Other Sleep Disorders?
It often is. Conditions like obstructive sleep apnea fragment sleep throughout the night, which increases the odds of arousal-related parasomnias like sleepwalking and confusional arousals. Treating the underlying sleep disorder frequently reduces parasomnia frequency as a secondary benefit, which is why a broader sleeping disorders evaluation is sometimes the most efficient path forward.
| Cause Category | Examples | How It Contributes |
| Lifestyle | Sleep deprivation, alcohol, irregular schedules | Disrupts normal sleep stage transitions |
| Genetic | Family history of sleepwalking or parasomnia | Increases baseline vulnerability to arousal disorders |
| Medical | Sleep apnea, medications, other sleep disorders | Fragments sleep or alters REM/NREM regulation |
| Psychological | Anxiety, depression, PTSD, chronic stress | Heightens arousal and destabilizes deep sleep |
How Can You Identify Your Personal Triggers?
Pinpointing your own parasomnia causes usually takes a bit of detective work, but it’s very doable with a consistent approach.
- Track your sleep patterns. Note your bedtime, wake time, and total hours slept each night for at least two weeks.
- Keep a symptom journal. Record when episodes happen, what you did that day, and anything unusual, like alcohol, travel, or a stressful event.
- Review your medications. List anything you’ve started or changed recently, including over-the-counter sleep aids.
- Ask a partner or family member to observe. Since many people have no memory of their own episodes, outside observation is often the most reliable data source.
- Consult a specialist. Bring your notes to a psychiatrist or sleep specialist who can help connect the patterns to a likely cause.
What Steps Should You Take If You Suspect a Trigger?
Once you’ve identified a likely pattern, whether it’s a new medication, disrupted sleep schedule, or rising stress, the next step is addressing it directly rather than waiting to see if it resolves on its own. Identifying and adjusting even one contributing factor, like alcohol use or sleep timing, often reduces parasomnia frequency within just a few weeks. If episodes continue despite lifestyle changes, that’s a strong signal it’s time for a professional evaluation.
Final Thoughts
There’s rarely a single explanation for why parasomnia happens. Most cases involve some combination of lifestyle factors like sleep deprivation and alcohol, a genetic predisposition, and, quite often, an underlying mental health or medical condition working in the background. The clearest path forward is identifying your own specific pattern, whether through sleep tracking, journaling, or the observations of someone close to you, and using that information to guide next steps. If your symptoms persist, worsen, or start affecting your safety or daily functioning, reaching out to our parasomnia treatment team or broader mental health providers for a proper evaluation is always a reasonable next move.
Ready to figure out what’s behind your symptoms? Schedule a consultation with Your Local Psychiatrist today.
Frequently Asked Questions
Can lack of sleep alone cause parasomnia?
Yes, sleep deprivation alone can trigger parasomnia episodes, particularly sleepwalking and confusional arousals, by increasing deep-sleep rebound. That said, most people who are prone to parasomnia also have another contributing factor, like genetics or stress, working alongside the sleep loss.
Is parasomnia caused by mental health conditions?
Mental health conditions like anxiety, depression, and PTSD are strongly associated with parasomnia, especially nightmares and sleep terrors. The relationship often runs both ways, since poor sleep can also worsen mental health symptoms over time.
Can parasomnia develop suddenly in adulthood?
Yes, new-onset parasomnia in adulthood is fairly common and is often linked to a specific trigger, such as a new medication, significant stress, alcohol use, or an underlying sleep disorder like sleep apnea. Sudden onset is worth mentioning to a provider, since it can help identify a treatable cause.
Do parasomnias run in families?
Often, yes. Sleepwalking in particular has a well-documented genetic component, and children of parents who sleepwalked are significantly more likely to experience it themselves.
Can medications trigger parasomnia episodes?
Yes, certain medications, especially SSRIs and other psychiatric medications, are well-documented parasomnia causes, commonly linked to vivid dreams, nightmares, and REM sleep behavior disorder. If you suspect a medication is contributing to your symptoms, talk to your prescriber before making any changes.
