A sleepwalking episode typically looks like someone moving around with their eyes open but with a blank, glassy stare, as if they’re awake but not quite “there.” The person may sit up in bed, stand, walk through the house, or perform surprisingly complex tasks, all while remaining in deep sleep. About 5% of children and 1.5% of adults experience sleepwalking in any given year, making it common enough that most people will eventually witness an episode in a family member or roommate.
The Eyes and Face
The most striking visual feature of a sleepwalker is their eyes. They’re usually open, which is why observers often assume the person is awake. But the expression behind those eyes is distinctly off. Sleepwalkers have a glazed, glassy-eyed look with no real focus or recognition. Their facial expression is flat and emotionally blank. There’s no sign of engagement with their surroundings, no reaction to things they’d normally respond to. If you’ve ever seen someone stare right through you, a sleepwalking episode looks like a more extreme version of that.
What Sleepwalkers Actually Do
Sleepwalking covers a wide range of behaviors, from barely moving to performing surprisingly detailed tasks. On the simpler end, a person might sit up in bed, look around the room, then lie back down. On the more complex end, sleepwalkers have been known to get dressed, rearrange objects around the house, open doors, or prepare food. Some people wake up to find evidence of their episode the next morning: uneaten food left out on the kitchen counter, furniture moved, or belongings relocated to unusual spots.
Movement during an episode tends to look purposeful but slightly clumsy or mechanical. Sleepwalkers can navigate around furniture and through doorways, but their coordination isn’t as sharp as when they’re awake. They may bump into things or move in a way that feels robotic or repetitive. The actions sometimes seem to follow a kind of internal logic, as though the person is acting out a scenario that makes sense to them but not to anyone watching.
How They Sound When You Talk to Them
Sleepwalkers can speak, but the conversation won’t make much sense. Their speech is slow, mumbled, and often incoherent. They may shout or talk in fragmented sentences. If you ask them a question, they’ll either ignore you completely or give a blunted, delayed response that doesn’t really answer what you asked.
This happens because the parts of the brain responsible for attention, planning, and social interaction are essentially offline during an episode. Motor function is preserved, so the body can move and the mouth can form words, but higher-level thinking is severely impaired or absent. The person is disoriented in both time and place. They don’t know where they are, what time it is, or that they’re doing anything unusual.
When and How Long Episodes Last
Sleepwalking happens during the deepest stage of non-REM sleep, known as N3, which is most concentrated in the first third of the night. This means episodes typically occur within the first few hours after falling asleep rather than closer to morning. Most episodes last anywhere from a few seconds to around 30 minutes, with shorter episodes being far more common. The person usually returns to bed on their own or can be gently guided back.
What Happens When the Episode Ends
The most disorienting aspect for witnesses is what happens afterward: the sleepwalker almost certainly won’t remember any of it. The amnesia isn’t a case of forgetting. The brain simply never forms the memories in the first place, because the cognitive functions responsible for memory encoding aren’t active during deep sleep. Research shows the overwhelming majority of sleepwalkers have no direct memory of what they did during an episode.
About 71% of diagnosed sleepwalkers do report having some kind of dream-like mental imagery associated with episodes, but this is vague and fragmentary. It’s not a clear narrative of walking to the kitchen or opening a door. It’s more like scattered impressions, if anything at all. If you describe to a sleepwalker what they did the night before, it will genuinely be news to them.
What to Do If You See Someone Sleepwalking
The old advice that waking a sleepwalker is dangerous is largely a myth. It won’t cause a heart attack or brain damage. But it can trigger a disorienting and unpleasant experience for the person, so most sleep experts recommend against it unless safety is at stake.
When woken abruptly from deep sleep, the brain struggles to transition from its low-energy sleep state to full wakefulness. This can cause an adrenaline surge, leading to a racing heart, sweating, confusion, and unpredictable behavior. The person may feel startled or threatened and could accidentally hurt themselves trying to get away from a situation they don’t understand. This is the real risk of waking a sleepwalker: not the waking itself, but the confused reaction that follows.
The safest approach is to calmly and gently guide the person back to bed using a quiet voice and light touch. Don’t grab them, shout, or shake them. If they’re near stairs, an open door, or anything dangerous, it is appropriate to wake them, but do it as gently as possible. After waking, stay with them until they’re fully alert, which may take a few minutes as the mental fog clears.
How Sleepwalking Differs From Being Awake
The combination of open eyes and physical movement makes sleepwalking convincingly similar to wakefulness at first glance. But several details give it away. The glassy, unfocused stare is the most obvious tell. The slow, flat speech and lack of meaningful response to questions are another. Movements may look somewhat normal but lack the fluid, responsive quality of a person who’s actually conscious. And there’s a complete absence of the small social cues you’d expect: no greeting, no eye contact, no reaction to their name being called, no awareness that anything unusual is happening.
If you’re unsure whether someone is sleepwalking or genuinely awake, try speaking to them in a normal conversational tone. A sleepwalker will either not respond at all or give a response so delayed and incoherent that the difference becomes clear quickly.