Is it dangerous to wake a sleepwalker?

Key takeaways

• Verdict: false. Waking a sleepwalker won’t give them a heart attack or cause any lasting harm.

• Expect confusion. Someone woken suddenly from sleepwalking is often disoriented for a moment, and they may be scared, upset, or angry.

• Grabbing them is the risky part. Many reports of sleepwalkers lashing out involve someone touching them, trying to wake them, or simply being close by.

• The real danger is the sleepwalking itself. Sleepwalkers get hurt by falling, tripping, or walking into things, so steer them away from stairs and doors.

• The gentlest approach works best. Talk to them calmly and guide them back to bed, often without waking them at all.

Where the myth comes from

The warning is centuries old, but it started as a different fear. In early modern Europe, people believed a sleepwalker who was woken suddenly would fall. A 2022 history of sleepwalking in 16th and 17th century writing traces the idea through several sources.

• The Malleus Maleficarum, the 15th century witch-hunting manual, claimed that demons held sleepwalkers up, and that calling one by name would send them crashing to the ground.

• The Dutch physician Levinus Lemnius wrote in 1559 that calling a sleepwalker by a familiar name would make them fall from fright.

• A character in Thomas Killigrew’s 1654 English comedy Thomaso says he has heard of sleepwalkers crossing rooftops “without danger, unless you awake them.”

That made some sense when the stories involved people on roofs and ledges. A startled person in a high place really could fall. Over time the warning seems to have lost its context, and the fall became shock, a heart attack, or even death. No study or medical source supports those versions.

What actually happens when you wake a sleepwalker

Sleepwalking happens during deep sleep, usually in the first few hours of the night. The sleepwalker’s brain is partly awake and partly asleep, which is why they can walk, open doors, and even talk while being unaware of what they’re doing.

Waking someone from that state isn’t dangerous to them. MedlinePlus, the US National Library of Medicine’s health site, says plainly that it’s a myth that waking a sleepwalker is dangerous. But being pulled out of deep sleep is jarring. According to the NHS, a sleepwalker who is woken suddenly may be confused, scared, angry, or upset. Most won’t remember the episode the next morning.

That reaction is where the small grain of truth sits. A confused person can lash out without knowing who they’re hitting, so wake them gently.

When sleepwalkers lash out

A 2017 review describes violence during sleepwalking as relatively uncommon and notes that nobody has measured how often it happens in the general population. When it does happen, contact is often the trigger.

A 2007 review of 32 published case reports of violent behavior during these partial awakenings found that in 40% to 90% of the sleepwalking cases, depending on how court verdicts were counted, the violence followed some kind of contact, such as being touched or woken, or someone simply being close by. Sleep lab staff were often hit when they grabbed a sleepwalker or blocked their path.

In a 2013 study of 140 adults treated at a French sleep clinic, 58% had a history of violent or dangerous behavior during episodes. In 17%, an episode had at least once led to an injury that needed medical care. About 11% had hurt themselves, and about 6% had hurt a bed partner. That’s a group of people with severe sleepwalking who were referred for treatment, so these numbers reflect severe cases.

Waking a sleepwalker is fine. Grabbing, shaking, or cornering one is what goes wrong.

How to get a sleepwalker back to bed

The NHS says to guide them gently back to bed and, if you need to wake them, to do it gently.

• Stay calm and keep your voice low. Sleepwalkers often respond to speech. In a 2025 study of home videos of sleepwalking episodes, two-thirds of the episodes where someone spoke to the sleepwalker included some kind of conversation, and some sleepwalkers simply did what they were asked, such as going back to bed.

• Steer, don’t drag. A light touch on the arm or shoulder to guide them is fine. Avoid holding them tightly or blocking their way.

• Wake them only if you need to. If they’re heading for the stairs, the front door, or a window, wake them by saying their name, from a short distance if you can.

• Expect a few seconds of confusion. Tell them where they are and that they were sleepwalking, and keep things quiet so they can fall back asleep.

• Don’t make a big deal of it in the morning. Most people don’t remember, and teasing or worry can add stress, which is itself a trigger.

How common is sleepwalking?

It’s much more common in children. A 2016 analysis of 51 studies covering more than 100,000 people found that about 5% of children and 1.5% of adults had sleepwalked in the past year, and 6.9% of people had done it at some point in their lives.

It runs in families. In a 2015 Canadian study of 1,940 children, sleepwalking peaked at 13.4% at age 10. Among children with no sleepwalking parent, 22.5% sleepwalked at some point in childhood, against 47.4% with one sleepwalking parent and 61.5% with two. Most children grow out of it.

What triggers an episode

• Not enough sleep. In a 2008 lab study of 40 adult sleepwalkers, half had an episode on a normal night, and 90% had one after being kept awake for 25 hours.

• Noise and disruption. In a 2008 study of 10 adult sleepwalkers, sounds played during deep sleep set off an episode in 30% of them after a normal night and in all of them after 25 hours awake.

• Stress, fever, and alcohol. The NHS lists all three, along with some sleeping pills.

• Some medicines. A 2018 review linked 29 drugs to sleepwalking, with the strongest evidence for the sleeping pill zolpidem and for sodium oxybate. Since 2019, the US label for zolpidem has carried a boxed warning about complex sleep behaviors, including sleepwalking and sleep driving.

• Other sleep problems. The NHS also lists sleep apnea and restless legs syndrome.

Making the house safer

Since the real risk is injury, the NHS suggests a few precautions if someone in your home sleepwalks.

• Keep doors and windows closed.

• Put a gate on the stairs.

• Clear the floor of things they could trip over.

• Lock away knives and sharp tools.

• Don’t let a child who sleepwalks sleep on the top bunk.

• Fit door alarms if there’s a risk they’ll leave the house.

For children who sleepwalk at about the same time every night, some doctors suggest scheduled awakenings, gently waking the child shortly before episodes usually start. The evidence is thin. The main study included just three children, though it stopped the sleepwalking in all of them. A 2017 review called it a tentative, low-risk option and noted that most sleepwalkers don’t need treatment at all.

When to see a doctor

Occasional sleepwalking in a child usually isn’t a worry. See a doctor if episodes happen often, if the sleepwalker has hurt themselves or someone else, or if they do something risky, such as leaving the house or trying to drive. Daytime tiredness or breathing that stops and starts at night are also reasons to get checked, since another sleep problem can be behind the sleepwalking. And if it started after a new medicine, tell the doctor who prescribed it.

Verdict: false

Waking a sleepwalker will not hurt them. The old warning began as a fear that a startled sleepwalker on a roof would fall, and it grew into stories of shock and heart attacks that no evidence supports. What is true is that a sleepwalker woken roughly may be confused and, rarely, may lash out. Talk to them calmly, guide them back to bed, and save the effort for making the house safe, since falls and trips are where sleepwalkers actually get hurt.

Frequently asked questions

What happens if you wake a sleepwalker?

Usually they’re confused for a few moments and may be scared or upset, then they settle. Waking them doesn’t cause a heart attack, shock, or any lasting harm.

Should you wake a sleepwalker or let them walk?

Guide them back to bed without waking them if you can. Wake them gently if they’re heading somewhere dangerous, such as the stairs or outside.

Can a sleepwalker hurt you if you wake them?

It’s uncommon, but it happens. In many reported cases, the sleepwalker lashed out after being touched, woken, or approached, so use your voice and a light touch.

Do sleepwalkers remember what they did?

Usually not. Most people have no memory of an episode, though in one study of adult sleepwalkers, most could recall a brief fragment of at least one, like a scene from a dream.

Is sleepwalking a sign of a serious problem?

Not usually, especially in children, who often grow out of it. Frequent episodes, injuries, or sleepwalking that started after a new medicine are worth raising with a doctor.

Can you sleepwalk from lack of sleep?

Yes. Sleep loss is one of the best-known triggers, and in one lab study, staying up for 25 hours nearly doubled the share of sleepwalkers who had an episode.