Do Spiders Go In Your Mouth When You Sleep?

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Is there any urban legend worse than “do spiders go in your mouth when you sleep?” The prospect of unintentionally eating eight-legged intruders is horrifying. Is there any truth to this disturbing theory, though? Having to deal with spiders in a bunk bed is enough to give you nightmares.

When you consider that spiders don’t have strong eyesight (despite having up to eight), it’s much more difficult for them to complete the voyage to human mouths, teeth, or foods in a year.

Continue to read about spiders going in your mouth when you sleep. 

Myth or Fact: Do you swallow spiders in your sleep?

As with most urban legends and stories, there’s no way to know the actual genesis of this urban legend. In reality, it’s one of those things that only makes sense if you hear it casually and don’t have time to think about it. When you start asking questions, everything starts to fall apart.

Do spiders go in your mouth when you sleep

For example, do spiders go in your mouth when you sleep? Surely, such a particular number would be backed up by evidence?

Why don’t spiders crawl all over you while you’re awake and sitting motionless if they’re daring enough to crawl on you while you’re sleeping?

The program of this post shows an explanation of money spider or wolf spider puts their insect parts on your face and goes into your stomach or not.

What about those who sleep with their lips shut? There isn’t even enough room to swallow a spider. And, if you sleep with an open mouth, wouldn’t your heated breath and potential snoring make it difficult for any spider to enter your mouth?

The absence of documented cases of humans eating spiders at night begs the issue of how the “statistic” of eight spiders swallowed each year came to be. 

Not only would studying accidental spider-swallowing be tough, but it isn’t easy to envision who would pay for such research or volunteer to take part in it.

The absence of hard evidence might explain why several versions of this myth abound, such as reports that humans swallow three spiders every year while sleeping or seven during their lifetime.

In the end, the urban legend has no basis in fact or science. It does, however, suggest that people have biases that can lead to disinformation and incorrect views. It’s a myth. 

Do spiders go in your mouth when you sleep? 

Spiders in hand

It is one of the most common spider misconceptions, yet it is untrue. Contrary to popular belief, spiders are considerably more terrified of you than you are of them. They like to be alone in calm, uninhabited areas of the house.

Each year, humans swallow an average of eight spiders while sleeping! The truth is that the chances of ingesting even a single spider in your lifetime are almost nil.

In actuality, a spider would be exceedingly unlikely to approach a sleeping human, let alone crawl inside its open mouth and wait to die.

While about one-quarter of the population fears spiders and other insects, spiders are far more terrified of you than you are of them. Consider this: the spider utilizes vibrations to detect danger.

A sleeping person is nothing but noise and vibration from your breath and heartbeat to tossing and turning, snores, snorts, and other sounds.

Everything about a sleeping person sends out a warning signal to spiders, indicating that they do not need to enter your bed at night. Instead, they prefer to spend their time caring for their webs or hanging out in quiet, uninhabited house areas.

But what if you come into contact with a spider whose ability to detect vibrations is impaired — or, worse, a suicidal spider searching for a way to end it all with a simple swallow? Sure, a spider might go against all instincts and crawl into your mouth or nose, but it’s exceedingly rare.

Why Won’t Spider Go Into Your Mouth When You Sleep in Home? – Facts

A young woman crouched in terror while surrounded by spiders

All the evidence suggests that swallowing spiders in your sleep is extremely improbable. Although not completely impossible, accidental spider-swallowing defies all chances and is unlikely to occur more than once a year.

Scientifically Impossible

The anatomy of spiders contains several traits that make eating a spider in your sleep very difficult. However, if this occurs, it will be entirely unintentional.

Spiders are noted for their strong reflexes and ability to survive. It’s no surprise that they’ve prospered in practically every part of the world.

Spiders are not foolish, and they will not choose to terminate their lives by crawling into the mouth of people in the middle of the night.

Also, keep in mind that you are big in the eyes of spiders, and they are terrified of you. If you aren’t threatening them, they will never disturb you.


Even though many people fear spiders, practically all common house spiders are solitary animals that shun human interaction. The reality is that people scare spiders more than they scare us.

Spiders have no motive to be in our beds in the first place. There’s rarely an excellent prey to be found there, and our sheer size and motions while sleeping are likely to frighten them away.


Chemoreceptors can be found on spider legs. Their purpose is to escape predators and search for prey while also helping them detect various substances. Spiders rely on touch, vibration, and taste to locate and discover their prey.

When a spider gets too close to a human mouth, its chemoreceptors assist in detecting the hundreds of different chemicals breathed.

Instead of going into the large CO2-exhaling “human cave,” a spider would be able to recognize danger and opt to travel oppositely.

No Face Target

Most people sleep with their mouths closed, so even if a spider got near to their face, it wouldn’t be able to go inside their mouth. The warm air from your breath, as well as any snoring sounds, will likely dissuade a spider from approaching your mouth.

Fear of Humans

Spiders will not approach a huge predator’s jaws of their own volition. Spiders view humans as a threat to their well-being. Humans sleeping are most usually seen as scary.

A sleeping human breathes, has a beating heart, and may snore, all of which produce vibrations that alert spiders to potential danger. We look like large, warm-blooded, menacing creatures who deliberately consume them.

Sleeping Habits

Mischievous young boy scaring his little sister on Halloween with a rubber spider

People move a lot when sleeping, and our breathing habits will keep a spider from creeping into our mouths. Even snoring and farting (which we all occasionally do) produce noises (vibrations) in the air that some spider species can detect using their hairs.

Many people sleep on their sides or their backs. Because sleeping on your back is extremely unusual, a spider will have to work extra hard to get inside your mouth. Your mouth does not gape open as you sleep.

Your mouth seldom opens more than 25% of its fully open position during sleep. That proportion of the space is too small for a spider to crawl within or even fall into your mouth accidentally. There’s no need to be concerned because it’s quite unusual that a spider will end up in your mouth.

Furthermore, because your face muscles are relaxed when you sleep, you do not swallow. It is why most people have saliva in their mouths when they wake up. However, that individual must be aware for it to be swallowed; once he awakens, the saliva must be swallowed.


Now that you have an answer to the most frequently asked question, “Do spiders actually crawl in your mouth at night?”, I believe you shouldn’t be concerned about eating spiders in your sleep. Instead, concentrate on establishing a relaxing bedroom atmosphere so you can get a better night’s sleep.

Vibrations are how spiders perceive the environment, and the vibrations we make — whether awake or sleeping — advise the spider to stay away. For them, we aren’t a welcoming part of the landscape.

To summarize, if a spider was suspended from the ceiling, it might fall into your mouth. But, in actuality, the possibilities of this happening are vanishingly slight, so there’s no need to be concerned about going to bed tonight.

About the author

A biotechnologist by profession and a passionate pest researcher. I have been one of those people who used to run away from cockroaches and rats due to their pesky features, but then we all get that turn in life when we have to face something.