Most people love the idea of turning their bedroom into a natural air-purifying sanctuary. A snake plant beside the bed, a peace lily on the windowsill, or a lush fern in the corner seems like an easy way to breathe cleaner air while sleeping.
But what if one of the most popular beliefs about houseplants isn’t quite true?
Scientists have confirmed that many indoor plants absorb carbon dioxide (CO₂), but research suggests their ability to improve air quality in a real bedroom is much more limited than most people realize.
Some plants even absorb carbon dioxide at night, while others release small amounts through respiration when the lights go out.
A 2025 study examining 40 common indoor plants found measurable carbon dioxide removal under controlled laboratory conditions. However, other research suggests that opening a window or improving ventilation may be far more effective than filling your bedroom with greenery.
So which plants actually absorb CO₂, how much can they help, and are they worth keeping near your bed?
The answers may surprise you.
Why Carbon Dioxide Builds Up in Your Bedroom at Night
Every time you breathe, your body takes in oxygen and releases carbon dioxide.
During sleep, this process continues for several hours.
In a bedroom with limited ventilation, carbon dioxide can gradually accumulate, especially when multiple people share the same space.
Outdoor CO₂ concentrations are generally much lower than the levels that can develop indoors when air exchange is insufficient.
Elevated indoor carbon dioxide is often used as an indicator of inadequate ventilation.
Some studies have associated poorly ventilated environments and higher CO₂ concentrations with sleepiness, headaches, and reduced cognitive performance. However, these effects can be influenced by other indoor pollutants and ventilation conditions, and not every increase in CO₂ is directly harmful.
This has led to growing interest in whether houseplants might offer a natural solution.
The answer depends on the type of plant, the amount of light it receives, its leaf area, and the conditions inside the room.
7 Bedroom Plants That Can Absorb Carbon Dioxide
1. Snake Plant — The Famous Nighttime CO₂ Absorber
Scientific name: Dracaena trifasciata (formerly Sansevieria trifasciata)
The snake plant is one of the most frequently recommended plants for bedrooms.
Its tall, upright leaves make it popular in modern interiors, and it requires relatively little maintenance.
But what makes it especially interesting is its unusual photosynthetic mechanism.
Unlike most plants, snake plants use a pathway known as Crassulacean Acid Metabolism, or CAM.
CAM plants can open their stomata at night, allowing them to absorb carbon dioxide when temperatures are cooler and water loss is reduced.
The absorbed CO₂ is temporarily stored in chemical form and used during photosynthesis.
This is why snake plants are often promoted as nighttime air purifiers.
What science actually says: A 2023 study investigating indoor plants under different lighting conditions found that snake plants demonstrated some nighttime CO₂ uptake, but their overall performance was inconsistent. The researchers also observed net CO₂ emissions under certain conditions.
Therefore, a snake plant should not be expected to significantly reduce the carbon dioxide produced by people sleeping in a bedroom.
Best bedroom placement: Near a window with bright, indirect light.
Care tip: Allow the soil to dry between waterings. Snake plants tolerate lower light but generally grow better with adequate indirect sunlight.
2. Peace Lily — A Strong Performer Under Bright Light
Scientific name: Spathiphyllum
Peace lilies are famous for their elegant white flowers and glossy green leaves.
They are frequently included on lists of plants that remove indoor pollutants.
But their ability to absorb carbon dioxide is more scientifically interesting than many people realize.
A 2025 study published in Process Safety and Environmental Protection tested 40 common indoor ornamental plants in sealed chambers under bright light.
One peace lily cultivar, Spathiphyllum floribundum ‘Palas’, was among seven plants capable of reducing CO₂ concentrations from approximately 1,200 parts per million to below 200 parts per million within nine hours under the study’s experimental conditions.
That sounds impressive, but there is an important limitation.
The experiment was conducted in a very small, sealed chamber with controlled lighting, not in a normal bedroom occupied by sleeping humans.
Peace lilies primarily absorb CO₂ through photosynthesis when sufficient light is available.
At night, without light, they generally release small amounts of carbon dioxide through cellular respiration.
Best bedroom placement: Bright indirect light, away from harsh direct sunlight.
Care tip: Keep the soil lightly moist without allowing it to become waterlogged.
3. Boston Fern — More Than Just a Decorative Plant
Scientific name: Nephrolepis exaltata
Boston ferns are admired for their thick, arching green fronds.
Their relatively large leaf surface makes them interesting candidates for indoor carbon dioxide studies.
In the 2025 laboratory investigation, a Boston fern cultivar was among the plants that demonstrated substantial CO₂ removal in a brightly lit, enclosed test environment.
However, an earlier real-world office study produced a different result.
Researchers compared rooms containing no plants, five Boston ferns, and eighteen Boston ferns.
Although the plants significantly increased indoor relative humidity, the researchers did not find a statistically significant reduction in corrected CO₂ concentrations.
This highlights an important distinction between laboratory performance and actual indoor air quality.
Best bedroom placement: Near a window with filtered daylight.
Care tip: Boston ferns prefer relatively humid conditions and consistently moist, well-drained soil.
4. Bird’s Nest Fern — A Leafy Plant With Measurable CO₂ Uptake
Scientific name: Asplenium nidus
The bird’s nest fern has broad, wavy leaves that form a distinctive rosette.
Unlike plants with many small leaves, its foliage provides a large surface area for photosynthesis.
Researchers included this species in the 2025 study of indoor carbon dioxide removal.
Under bright laboratory lighting, it was among the seven plants that achieved particularly strong CO₂ reductions in the sealed test chambers.
The researchers also observed a relationship between total leaf area and carbon dioxide removal.
Plants with more leaf surface tended to absorb more CO₂ under the experimental conditions.
However, this does not mean that a single large fern can meaningfully offset the carbon dioxide produced by a sleeping person.
In a normal home, temperature, available light, ventilation, and plant growth all influence its performance.
Best bedroom placement: Bright, indirect light in a relatively humid area.
Care tip: Avoid allowing water to accumulate in the center of the plant, which can encourage rot.
5. Baby Rubber Plant — Small Leaves, Interesting Science
Scientific name: Peperomia obtusifolia
The baby rubber plant is a compact tropical houseplant with thick, glossy leaves.
It is particularly attractive for small bedrooms because it doesn’t require much space.
Despite its modest size, it was another strong performer in the 2025 CO₂ removal experiment.
Under bright light, this species demonstrated the ability to reduce carbon dioxide concentrations in a small, controlled chamber.
However, a plant’s effectiveness depends not only on its species but also on its size and growing conditions.
A small potted plant with limited leaf area will generally have a smaller total photosynthetic capacity than a larger, healthy specimen receiving adequate light.
Best bedroom placement: A bedside shelf or windowsill receiving bright, indirect sunlight.
Care tip: Allow the upper layer of soil to dry before watering.
6. Guzmania — A Tropical Plant With a Surprising Ability
Scientific name: Guzmania
Guzmania bromeliads are tropical plants recognized by their bright, colorful flower-like bracts and long green leaves.
They are often grown as decorative indoor plants.
A variegated Guzmania magnifica cultivar was included among the strongest performers in the 2025 laboratory study.
It successfully absorbed carbon dioxide under bright light in the experimental chamber.
Interestingly, certain bromeliads can adjust aspects of their photosynthetic metabolism under environmental stress.
Some species display CAM-related characteristics, although this does not mean every Guzmania plant consistently absorbs CO₂ throughout the night.
The degree and timing of carbon uptake depend on the species and environmental conditions.
Best bedroom placement: Bright, filtered daylight.
Care tip: Avoid prolonged exposure to intense direct sunlight and follow species-specific watering guidance.
7. Silver Lace Fern — A Lesser-Known CO₂ Absorber
Scientific name: Pteris ensiformis
Silver lace fern is known for its delicate, narrow foliage and attractive green-and-silver leaf patterns.
While it is less famous than the snake plant or peace lily, it deserves attention because of its performance in laboratory research.
A cultivar called Pteris ensiformis ‘Victoriae’ was one of the seven species identified as particularly effective at removing CO₂ from the small sealed chambers used in the 2025 experiment.
Like most ferns, it relies on light-driven photosynthesis to absorb carbon dioxide.
This means it is unlikely to remove meaningful amounts of CO₂ while a bedroom remains dark overnight.
Nevertheless, it can make an attractive addition to a well-lit indoor environment.
Best bedroom placement: An area with filtered daylight and moderate humidity.
Care tip: Keep the soil evenly moist but not saturated.
The Surprising NASA Study That Helped Create the Houseplant Myth
Much of the excitement surrounding air-purifying houseplants began with research conducted by NASA in the late 1980s.
Scientists were interested in whether plants could help remove certain pollutants from enclosed environments, including potential space habitats.
The research demonstrated that some plants and their associated root-zone systems could remove specific volatile organic compounds from air inside experimental chambers.
These findings were widely publicized.
Over time, the message became simplified into a popular claim: putting a few houseplants in your home can significantly purify the air.
But researchers later identified a major problem with that interpretation.
The original experiments were conducted in small, controlled environments.
Real homes are significantly larger, and their air is continuously exchanged through ventilation, leaks, doors, and windows.
The amount of pollution plants remove under sealed laboratory conditions does not necessarily translate into a measurable benefit in a normal bedroom.
Scientists Found You May Need Hundreds of Plants to Match Normal Ventilation
One of the most striking findings came from researchers at Drexel University.
In a review published in 2019, the researchers analyzed 12 previous studies examining the ability of potted plants to remove volatile organic compounds from indoor air.
They calculated how quickly plants actually removed these pollutants.
Their conclusion challenged decades of popular houseplant advice.
Depending on plant performance and environmental conditions, the researchers estimated that approximately 10 to 1,000 plants per square meter of floor space would be required to match the removal of certain volatile organic compounds achieved by ordinary building air exchange.
That is an enormous number of plants.
However, there is an important distinction: this finding specifically concerned volatile organic compounds, such as certain chemical vapors, rather than carbon dioxide.
The calculation should not be used to claim that the same number of plants is required to remove CO₂.
Still, the study demonstrates how laboratory findings can create exaggerated expectations about real-world air purification.
What a 2025 Study of 40 Houseplants Actually Discovered
In August 2025, researchers published an investigation measuring the carbon dioxide removal capacity of 40 common ornamental plants.
The plants were placed in small sealed chambers measuring approximately 0.128 cubic meters.
Researchers started with elevated CO₂ concentrations of approximately 1,200 ppm and exposed the plants to bright light.
All 40 species demonstrated significant carbon dioxide removal under the experimental conditions.
Seven species were particularly effective, reducing CO₂ to below 200 ppm within nine hours.
The researchers also found that total leaf area was strongly associated with overall CO₂ uptake.
This suggests that larger, healthier plants with more leaves may absorb more carbon dioxide when conditions support photosynthesis.
However, the results do not prove that seven small houseplants can dramatically reduce CO₂ in a typical bedroom.
A real room contains far more air than the laboratory chamber, and sleeping occupants continuously produce additional carbon dioxide.
Most importantly, bedrooms are generally dark during the night, when many plants are no longer actively removing CO₂ through photosynthesis.
The study supports the biological ability of plants to absorb carbon dioxide but does not establish that ordinary houseplants provide a meaningful substitute for ventilation.
Do Bedroom Plants Release CO₂ While You Sleep?
Yes, many do.
Plants perform two separate biological processes: photosynthesis and cellular respiration.
During photosynthesis, plants absorb carbon dioxide and use light energy to produce sugars, releasing oxygen as a byproduct.
During cellular respiration, plants consume oxygen and release carbon dioxide.
Respiration occurs both day and night.
When there is insufficient light for photosynthesis, many plants become net producers of small amounts of CO₂.
This has led to another popular misconception: that sleeping with plants is dangerous because they consume oxygen at night.
For a typical number of houseplants, their respiratory effect is far too small to meaningfully deplete oxygen in a normally ventilated bedroom.
CAM plants, such as snake plants, are somewhat different because they can absorb CO₂ during the nighttime under suitable conditions.
However, their uptake is generally modest relative to human breathing, and their overall carbon balance varies.
The important takeaway is that bedroom plants are generally safe, but they should not be treated as nighttime oxygen generators or powerful carbon dioxide filters.
Can Bedroom Plants Actually Improve Sleep?
There is some evidence that indoor greenery may support psychological well-being.
Research into indoor plants and natural environments has explored possible associations with reduced perceived stress, improved mood, and greater feelings of relaxation.
For some people, caring for plants can become a calming daily ritual.
A pleasant indoor environment may also make a bedroom feel more comfortable and inviting.
However, these possible benefits should not be confused with proven improvements in sleep caused by CO₂ removal.
There is currently insufficient evidence that placing a few ordinary houseplants in a bedroom significantly lowers overnight carbon dioxide levels or directly improves sleep quality through changes in oxygen concentration.
If the room is poorly ventilated, adding plants will not reliably solve the problem.
The Hidden Downsides of Too Many Bedroom Plants
Although houseplants are generally beneficial as decorative elements, there are a few considerations worth remembering.
1. Excess moisture and mold
Overwatered soil can encourage fungal growth, particularly when drainage is poor.
2. Allergies and sensitivities
Some individuals may react to pollen, plant material, or mold growing in damp potting soil.
3. Higher humidity
Certain plants increase indoor humidity through transpiration. This may be useful in dry environments, but excessive moisture can contribute to condensation and mold problems.
4. Pet toxicity
Some popular indoor plants, including snake plants and peace lilies, can cause illness if chewed or swallowed by pets.
5. A false sense of clean air
Perhaps the most overlooked problem is assuming that plants eliminate the need for fresh air.
A green bedroom can still contain elevated carbon dioxide, indoor pollutants, and inadequate ventilation.
What Actually Works Better Than Houseplants for Bedroom Air Quality?
If your goal is to create a healthier sleeping environment, several practical steps are more effective than relying on plants alone.
Improve ventilation
Use an appropriately functioning ventilation system or open windows when outdoor air quality, weather, and safety conditions permit.
Ventilation helps dilute carbon dioxide and many indoor-generated pollutants.
Monitor indoor CO₂
A reliable CO₂ monitor can help identify patterns of inadequate ventilation, especially overnight.
Readings must be interpreted in context, since there is no single CO₂ value that perfectly defines air quality in every building.
Control moisture
Prevent persistent condensation and repair leaks.
Proper humidity control can reduce conditions that support mold growth.
Reduce pollution sources
Limit indoor smoking, unnecessary fragrance products, and other avoidable sources of airborne pollutants.
Consider filtration when appropriate
A properly sized HEPA air purifier can help reduce airborne particles such as dust, pollen, and some aerosols.
However, ordinary HEPA filters do not remove carbon dioxide. Ventilation is still necessary.
So, Should You Keep Plants in Your Bedroom?
Absolutely, if you enjoy them and can care for them safely.
Plants can make a room feel more peaceful, add natural beauty, and provide a connection to greenery.
Some species genuinely absorb carbon dioxide under appropriate conditions, and certain plants demonstrate interesting nighttime carbon uptake.
But their benefits should be understood realistically.
The scientific evidence does not support treating a few potted plants as a replacement for fresh air, ventilation, or effective indoor pollution control.
If you want a bedroom plant, choose one that suits the available light, space, and humidity.
A snake plant may be attractive for its low maintenance requirements and unusual CAM metabolism.
Peace lilies and ferns can offer lush foliage, while Peperomia provides a compact alternative.
The best plant is one that thrives in your actual bedroom conditions rather than one purchased because of exaggerated air-purification promises.
The Bottom Line
Houseplants really do interact with carbon dioxide.
Some absorb it during daylight, while certain CAM species can take it up at night.
A 2025 study demonstrated that several common indoor plants can significantly reduce CO₂ concentrations in small laboratory chambers under bright light.
But the scientific evidence also reveals a major limitation: what works in a sealed laboratory chamber may have little measurable effect in a normal bedroom.
Research conducted in real indoor environments has shown that plants do not necessarily produce significant changes in CO₂ concentrations, even when several are placed together.
For a healthier sleeping environment, adequate ventilation remains much more important.
So enjoy your snake plants, ferns, and peace lilies.
Just remember that while they may make your bedroom greener and more relaxing, they are unlikely to do the work of an open window or a properly functioning ventilation system.
Medical and environmental health disclaimer: This article is intended for educational purposes. Indoor air quality depends on ventilation, building conditions, pollution sources, and individual circumstances.
