Sleepwalking in adults happens when parts of your brain wake up while others stay asleep, creating a split state where you can move and act but can’t think clearly or form memories. About 3.6% of U.S. adults experience at least one episode in a given year, and the triggers range from genetics and stress to sleep apnea and certain medications. Unlike childhood sleepwalking, which most people outgrow, adult-onset episodes often have an identifiable cause.
A Brain Caught Between Sleep and Waking
Sleepwalking isn’t a dream acted out. It occurs during the deepest phase of non-REM sleep, when your brain is supposed to be in its most restful state. During a normal transition from deep sleep toward lighter sleep or wakefulness, the entire brain shifts together. In sleepwalkers, that transition fractures. Brain imaging studies have shown that during an episode, the motor cortex and emotional centers of the brain display fast, wake-like electrical activity, while the frontal regions responsible for judgment, decision-making, and memory remain locked in deep sleep patterns with slow delta waves.
This is why sleepwalkers can navigate hallways, open doors, and even hold fragmented conversations, yet have no awareness of what they’re doing and almost never remember it afterward. The parts of the brain that control movement and emotion are online; the parts that provide conscious control are not. Researchers have also found that sleepwalkers show increased “motor impulsivity,” meaning the brain’s normal ability to inhibit movement during sleep is weakened. This reduced brake on the motor system helps explain why some episodes involve complex or even aggressive behaviors.
Genetics Play a Significant Role
If your parents sleepwalked, your chances are considerably higher. Research from the American Academy of Neurology identified a specific genetic link tied to the HLA system, a set of genes that governs immune function. In one study, 50% of adult sleepwalkers carried a particular HLA gene variant, compared to 24% of healthy controls. Population-based twin studies have confirmed the hereditary pattern: lifetime prevalence of sleepwalking reaches about 29%, and much of that clustering runs in families. You don’t inherit sleepwalking itself so much as a brain architecture that’s more prone to those incomplete arousals from deep sleep.
Sleep Deprivation and Alcohol
Anything that deepens or fragments your sleep can set the stage for an episode. Sleep deprivation is one of the most reliable triggers because it causes your brain to compensate with more intense deep sleep the next time you do rest. That extra-deep sleep creates stronger “pressure” on the brain during transitions, making it harder for all regions to wake up in sync. The result is exactly the kind of partial arousal that produces sleepwalking.
Alcohol works through a similar mechanism. It acts as a sedative that initially pushes you into deeper sleep, then disrupts sleep architecture in the second half of the night as your body metabolizes it. Those disruptions create repeated partial arousals from deep sleep. Johns Hopkins Medicine lists alcohol as one of the most common triggers, and notes that simply not drinking can prevent episodes in some people.
Medications That Trigger Episodes
Several classes of medication are known to provoke sleepwalking, particularly drugs that alter how your brain moves between sleep stages. The sleep aid zolpidem is among the most frequently reported culprits, with multiple published case reports linking it to sleepwalking episodes. The risk increases when zolpidem is combined with other medications. One documented case involved sleepwalking triggered by the interaction between zolpidem and an antidepressant; another involved its combination with a seizure medication.
Beyond zolpidem, other sedatives, certain antipsychotics, lithium, and benzodiazepines have all been associated with sleepwalking. The common thread is that these drugs can intensify deep sleep or interfere with the brain’s ability to transition cleanly between sleep stages. If your sleepwalking started around the same time as a new prescription, that connection is worth raising with whoever prescribed it.
Sleep Apnea as a Hidden Trigger
Obstructive sleep apnea, a condition where the airway repeatedly collapses during sleep, is an underrecognized cause of adult sleepwalking. Each time the airway closes, oxygen levels drop and the brain is forced into a partial arousal to restore breathing. These forced arousals happen dozens or even hundreds of times per night in severe cases, and each one is an opportunity for the brain to wake up unevenly, with motor areas activating while higher cognitive areas stay asleep.
Case studies have documented patients whose sleepwalking episodes followed a visible pattern on sleep recordings: a breathing pause, signs of choking, a burst of abnormal brain waves, and then sleepwalking behavior. In at least one published case, treating the sleep apnea with a CPAP machine (which keeps the airway open with gentle air pressure) completely eliminated the sleepwalking. This is one reason sleep specialists often order a sleep study for adults who start sleepwalking, particularly if they also snore, wake up feeling unrested, or have been told they stop breathing at night.
Stress, Anxiety, and Emotional Load
Psychological stress is consistently identified as a contributing factor. Stress doesn’t cause sleepwalking on its own, but it amplifies the conditions that make episodes more likely. High stress disrupts sleep continuity, increases the number of arousals from deep sleep, and can worsen sleep deprivation, all of which feed the same mechanism. People who are genetically predisposed to sleepwalking often find that episodes cluster during periods of high emotional strain, major life transitions, or untreated anxiety. The Stanford study that estimated 3.6% adult prevalence also noted the connection between mental health conditions and sleepwalking frequency.
Who Is More Likely to Sleepwalk
Population studies show that about 3 to 4% of adults sleepwalk at least occasionally, with roughly 0.4% experiencing episodes weekly. Men appear slightly more prone as adults (3.9% vs. 3.1% of women in one large twin study), which is a reversal from childhood, where girls sleepwalk somewhat more often. Adults who sleepwalked as children are at higher risk of recurrence, especially when exposed to triggers like sleep deprivation, new medications, or untreated sleep disorders.
The combination of multiple risk factors matters more than any single one. Someone with a family history of sleepwalking who also has untreated sleep apnea, takes a sedative medication, and is chronically short on sleep faces a much higher likelihood of episodes than someone with just one of those factors.
Reducing Episodes and Staying Safe
Because sleepwalking stems from incomplete arousals during deep sleep, the most effective strategies target whatever is disrupting your sleep transitions. Keeping a consistent sleep schedule and getting enough total sleep reduces the deep-sleep rebound that triggers episodes. Cutting out alcohol, especially in the hours before bed, removes one of the most common provocations. If a medication is suspected, adjusting the dose or timing under medical guidance often helps.
For people whose sleepwalking persists, environmental safety becomes important. The Mayo Clinic recommends locking all exterior doors and windows before bed, installing gates at stairways, moving tripping hazards like electrical cords, sleeping on the ground floor when possible, and keeping sharp objects and weapons secured. Alarms or bells on bedroom doors can alert a household member when an episode begins. These precautions matter because sleepwalkers can injure themselves without any awareness of danger, and episodes involving stairways, kitchens, or exits from the home carry real risk.
If you’re an adult experiencing new or worsening sleepwalking, identifying the specific trigger is the most productive step. A sleep study can reveal whether sleep apnea or another sleep disorder is driving the episodes, and a medication review can flag prescriptions that may be contributing. In many cases, once the underlying trigger is addressed, the sleepwalking stops.