Quick Answer: Sleepwalking is an NREM parasomnia: part of the brain wakes enough to move while the rest stays deeply asleep. A Sleep Medicine population study found 22.4% of people have sleepwalked at least once in their lives. It is most common in children and usually outgrown. In adults, sleep deprivation, stress and certain medications are the main triggers, and bedroom safety comes first.
Sleepwalking (the medical term is somnambulism) is a disorder of arousal from deep NREM sleep: the walking, door-opening, even snack-making happens while the thinking brain is still offline. It is one of the most common entries in our sleep phenomena encyclopedia, and one of the most misunderstood. Bjorvatn and colleagues' population study in Sleep Medicine (2010) found 22.4% of people had sleepwalked at least once, though only 1.7% had done it in the past three months, which tells you most sleepwalking is a childhood phase rather than a lifelong condition. It also travels in a family of related events, like night terrors, that all rise out of the same deep-sleep stage. Mattress Miracle is a family-owned sleep store in Brantford, Ontario, not a clinic; we publish this because parents and partners ask us, and because the practical half of sleepwalking, the safe bedroom, is genuinely our department. The medical half belongs to your doctor.
"Parents ask about sleepwalking constantly, and my first question is always about the bedroom, not the child. How high is the bed? What is on the floor between the bed and the door? Is there a bunk bed involved? You cannot always stop a sleepwalker from getting up, but you can decide what they meet when they do. That part is completely in your control, and it costs almost nothing."
Brad Grose, founder, Mattress Miracle, family owned in Brantford since 1997, with 40+ years in the mattress industry
In This Guide
Reading Time: 7 minutes
Why do people sleepwalk?
People sleepwalk because the brain's transition out of deep sleep misfires. Sleepwalking rises out of slow-wave NREM sleep, the deepest stage, concentrated in the first third of the night. In a normal night the whole brain moves between stages together; in a sleepwalker, the motor systems and some basic behaviours switch on while the prefrontal cortex, the part that plans, reasons and forms memories, stays asleep. The result is a person who can navigate a hallway, open a fridge or answer in short phrases with the lights on upstairs and nobody home. Episodes usually happen one to two hours after falling asleep, last a few minutes, and leave no memory. Genetics load the dice heavily: sleepwalking runs strongly in families, and a child with one sleepwalking parent has sharply higher odds of doing it too.
Who sleepwalks most?
Children sleepwalk far more than anyone else, because they spend more of the night in the deep NREM sleep where episodes begin. Most childhood sleepwalkers simply outgrow it as deep sleep naturally declines through adolescence. The Bjorvatn population study's gap between lifetime prevalence (22.4%) and current prevalence (1.7%) is that outgrowing, measured. Adult sleepwalking is much less common and worth more attention: it is either a childhood pattern that persisted, or a new behaviour with an identifiable driver, and new-onset sleepwalking in adulthood always deserves a look at what changed, from stress to medications to an undiagnosed sleep disorder.
What triggers sleepwalking in adults?
Adult sleepwalking triggers are mostly things that deepen sleep pressure or fragment deep sleep:
- Sleep deprivation: the strongest trigger; recovery sleep after short nights runs deeper, and deeper NREM means more raw material for an episode
- Stress and fever: both fragment sleep and increase partial arousals
- Alcohol near bedtime: distorts sleep architecture in exactly the wrong direction
- Untreated sleep apnea: repeated micro-arousals out of deep sleep can launch episodes
- Medications: some sedative sleep aids, including zopiclone, carry warnings for complex sleep behaviours, walking, eating, even driving while not fully awake; our zopiclone side effects guide covers what the Canadian monograph says, and any medication-linked sleepwalking is an immediate prescriber conversation
Is sleepwalking dangerous? Making the bedroom safe
Sleepwalking itself is benign; the furniture, stairs and windows are the hazard. A sleepwalker's brain handles familiar routes surprisingly well and novel obstacles terribly. The bedroom setup that removes most of the risk:
- Keep the bed low: a platform bed or low-profile frame shortens the fall that starts many injuries
- No bunk beds for any child who has ever sleepwalked
- Clear the route: nothing on the floor between bed and door; no glass tables or sharp corners in the path
- Secure the exits: locked windows, a gate at the top of stairs, and a simple bell or chime on the bedroom door so someone hears the episode start
- Hide the keys: car keys and door deadbolt keys out of habitual reach for adult sleepwalkers
None of this stops the episode; all of it changes what the episode can cost.
How to reduce sleepwalking episodes
Reducing sleepwalking starts with protecting deep sleep from the things that destabilize it. Keep a consistent schedule and pay down sleep debt, since exhaustion is the number one trigger. Cut evening alcohol. Treat snoring and suspected apnea rather than living with them. For children with frequent, predictable episodes, doctors sometimes suggest scheduled awakenings, briefly rousing the child 15 to 30 minutes before the usual episode time for a couple of weeks to break the pattern. Manage the stress load honestly; the techniques in our Insomnia Help hub and the fundamentals in the sleep hygiene guide serve double duty here. And review medications with a pharmacist if episodes started after a prescription change.
When to see a doctor about sleepwalking
See a doctor about sleepwalking when episodes are frequent, violent or injurious, when they start fresh in adulthood, when they involve leaving the house, or when they come with loud snoring, gasping or daytime exhaustion that suggests sleep apnea underneath. Children with occasional calm episodes and a family history rarely need more than safety measures and patience. Adults with new, escalating or dangerous episodes should ask about a sleep study; sleepwalking that is really apnea-driven improves when the apnea is treated.
The showroom perspective
Mattress Miracle has fitted beds for Brantford families since 1997, and sleepwalking questions usually arrive from parents choosing a first big-kid bed or partners of adult sleepwalkers. The honest advice is unglamorous: go low, go stable, keep the pathway clear, and skip the bunk. Come by 441 1/2 West Street or call (519) 770-0001 and tell us the situation; our non-commission team has set up more than a few sleepwalker-safe bedrooms.
Frequently Asked Questions
Why do people sleepwalk?
Sleepwalking happens when the brain only partially wakes from deep NREM sleep: motor systems switch on while the reasoning, memory-forming parts stay asleep. It runs strongly in families, peaks in childhood when deep sleep is most abundant, and is triggered in adults mainly by sleep deprivation, stress, alcohol and some medications.
Is it dangerous to wake a sleepwalker?
No, that is a myth. Waking a sleepwalker will not harm them, though they may be confused or startled for a minute. It is usually easier and kinder to gently steer them back to bed without fully waking them, but if they are heading for stairs or a door, wake them without hesitation.
Do children outgrow sleepwalking?
Most do. Sleepwalking peaks in childhood because deep NREM sleep peaks in childhood, and episodes usually fade through adolescence as that stage naturally shrinks. Population data reflects it: 22.4% of people have sleepwalked at some point, but only 1.7% did so recently.
Why did I suddenly start sleepwalking as an adult?
New adult sleepwalking almost always has a driver worth finding: severe sleep debt, high stress, alcohol, a new medication, or undiagnosed sleep apnea fragmenting deep sleep. It is not dangerous by itself, but new onset in adulthood is the one version that should always get a doctor's look.
Can sleeping pills cause sleepwalking?
Some can. Sedative sleep aids, including zopiclone (Imovane), carry Canadian label warnings for complex sleep behaviours such as walking, eating or driving while not fully awake. If sleepwalking started after a new prescription, stop guessing and call your prescriber or pharmacist promptly.
Visit Our Brantford Showroom
Mattress Miracle
441 1/2 West Street, Brantford
Phone: (519) 770-0001
Hours: Mon-Wed 10-6, Thu-Fri 10-7, Sat 10-5, Sun 12-4
Setting up a safe bedroom for a sleepwalker? Low-profile beds, stable frames and honest advice are all in stock. Come tell us who is doing the wandering; no pressure, from the family that has done this since 1997.
Related Reading
- Night terrors: what they are and how to respond
- The sleep phenomena encyclopedia
- Sleep paralysis: why it happens and how to reduce episodes
- Zopiclone side effects, explained
Sources
- Bjorvatn, B., Grønli, J. and Pallesen, S. (2010). "Prevalence of different parasomnias in the general population." Sleep Medicine, 11(10), 1031-1034. PubMed 21093361
- Imovane (zopiclone) Product Monograph, complex sleep behaviours warning: pdf.hres.ca