Screaming in your sleep is most often caused by a type of parasomnia, a category of sleep disorders where your brain partially wakes up while you’re still asleep. The most common culprit is night terrors (also called sleep terrors), which affect roughly 2% of adults. But several other conditions can cause it too, and figuring out which one depends on when the screaming happens, whether you remember it, and what else is going on with your body during the episode.
Night Terrors: The Most Common Cause
Night terrors are the leading reason adults scream in their sleep. During an episode, you might shout, thrash around, or even bolt out of bed in a panicked state, all while your eyes are open but you’re not actually awake. Your heart rate spikes, you may sweat heavily, and you can look genuinely terrified. Episodes can last up to 15 minutes and sometimes happen more than once a night.
The defining feature of night terrors is that you almost never remember them. If your partner tells you that you screamed but you have zero memory of it, night terrors are the likely explanation. They happen during the first few hours of sleep, during the deepest stage of non-REM sleep. Your brain gets caught in a strange in-between state: brain imaging has shown that during these episodes, the parts of the brain controlling movement and basic awareness can shift into wakefulness while the frontal regions responsible for conscious thought and memory stay locked in deep sleep.
This is different from nightmares, which happen later in the night during REM sleep. With nightmares, you wake up and can recall the dream. With night terrors, you’re performing behaviors (screaming, moving, looking around) without any conscious awareness or dream recall afterward.
REM Sleep Behavior Disorder
If your screaming involves acting out vivid dreams, and you can remember those dreams, the cause may be REM sleep behavior disorder (RBD). Normally, your body becomes temporarily paralyzed during REM sleep so you don’t physically act out your dreams. In RBD, that paralysis system doesn’t work properly, so you kick, punch, shout, or scream while dreaming.
RBD is most common in men over 50 and affects about 2% of the general population. It deserves medical attention because it carries a significant neurological signal. In people who develop RBD without an obvious cause (called isolated RBD), there is an 80 to 90% chance of progressing to a neurodegenerative condition like Parkinson’s disease or dementia with Lewy bodies within 10 years. This doesn’t mean everyone who acts out a dream once has a brain disease, but persistent RBD symptoms are worth discussing with a doctor, especially for older adults.
Catathrenia: Groaning That Sounds Like Screaming
Sometimes what a bed partner describes as screaming or moaning is actually catathrenia, a condition where you produce loud groaning sounds as you breathe out during sleep. The sounds come from your vocal cords and can be rhythmic or semi-rhythmic, lasting anywhere from under a second to over two minutes. Unlike snoring, which happens during both inhaling and exhaling and has a chaotic, guttural quality, catathrenia sounds are more tonal and occur only on the exhale.
Catathrenia is harmless and doesn’t disrupt your own sleep quality, though it can be alarming (and annoying) for anyone sharing your bed. Most people with catathrenia have no idea they’re doing it until someone tells them.
Sleep Apnea Can Trigger Screaming Episodes
One connection many people don’t expect: obstructive sleep apnea can trigger parasomnias, including night terrors and screaming. When your airway repeatedly closes during sleep, it causes fragmented sleep and drops in oxygen levels. These repeated disruptions can impair normal arousal mechanisms and push your brain into the kind of unstable, half-awake state that produces parasomnia episodes.
Research has found that a large proportion of adults who meet the criteria for chronic non-REM parasomnias like sleep terrors actually have episodes induced by sleep apnea. The encouraging part: when the apnea is effectively treated, the parasomnia symptoms often resolve too. If you snore heavily, wake up gasping, or feel exhausted despite a full night’s sleep, untreated apnea could be the hidden trigger behind your screaming episodes.
Common Triggers That Make It Worse
Even if you have an underlying tendency toward night terrors or other parasomnias, specific triggers can increase how often episodes happen. The biggest ones are:
- Sleep deprivation. Being overtired or severely short on sleep is one of the strongest triggers for night terrors in adults.
- Stress and anxiety. Emotional pressure during the day directly increases the likelihood of parasomnia episodes at night.
- Alcohol use. Alcohol fragments sleep architecture and can provoke episodes in people who are susceptible.
For many adults, screaming episodes happen in clusters during particularly stressful or sleep-deprived periods, then disappear when life settles down.
What Happens in Your Brain During an Episode
Night terrors appear to involve a failed transition between deep non-REM sleep and REM sleep. This would explain the unusual combination of features: the intense autonomic activation (racing heart, sweating) and vivid emotional experience typical of REM sleep, combined with the extreme difficulty of waking someone up, which is characteristic of the deepest stage of non-REM sleep. Your brain is essentially running two incompatible programs at once.
Serotonin plays a role in this process. Research has identified that serotonin activity in a specific area deep in the brainstem, involved in processing fear and threat responses, may be central to triggering the terror itself. This is why certain antidepressants that increase serotonin levels have been effective at reducing or eliminating episodes in some people.
How Sleep Screaming Is Managed
The first priority is physical safety. If you’re thrashing or getting out of bed during episodes, remove sharp objects and furniture edges near the bed, and consider sleeping on a mattress closer to the ground. A bed partner should avoid trying to restrain you during an episode, as that can increase agitation.
Beyond safety, treatment focuses on identifying and removing triggers. Keeping a consistent sleep schedule, reducing alcohol, and managing stress can significantly reduce episode frequency. A technique called anticipatory awakening can also help: if episodes tend to happen at a predictable time each night, briefly waking yourself about 15 minutes beforehand, then falling back asleep, can interrupt the pattern.
When episodes are frequent enough to affect daily functioning or relationships, cognitive behavioral therapy, hypnosis, or relaxation therapy may help, particularly when stress or anxiety is a contributing factor. Medications that boost serotonin activity are sometimes used for persistent cases. Certain sedatives have shown effectiveness too, but they’re generally not a first choice because of the risk of dependence and because stopping them can sometimes cause episodes to return even more intensely than before.
If your screaming involves acting out dreams (pointing toward RBD rather than night terrors), or if you also have symptoms of sleep apnea, a sleep study can clarify the diagnosis and direct treatment toward the right underlying cause.