Bedroom plants and sleep: what science really says (and what it doesn’t)

This article examines what science really says about the relationship between bedroom plants and sleep, distinguishing verified mechanisms from myths. To choose the best plants for your bedroom, read our guide to plants for better sleep.

You’ve surely also read that headline promising miracles: a 37% increase in sleep quality simply by adding greenery next to your pillow. If you’re wondering whether the effect of bedroom plants on sleep is a magic formula or a documented reality, you’ve come to the right place. As a third-generation grower, I’ve learned that nature doesn’t need inflated numbers to prove its worth, but it does need the truth. In this in-depth article, you won’t find sensational promises, but a rigorous review of the sources and a practical selection based on real data. We’ll look at why bedroom plants are good or bad for you, debunking myths and focusing on three fundamental pillars: humidity regulation, the biophilic response to stress, and the actual air-filtering capacity. If you want to move from theory to practice, browse our indoor plants.

The “+37%” claim and the gap no one noticed

Serious science almost never produces round, universal figures like a +37% improvement in sleep quality, because individual and environmental variables make such a precise measurement impossible without a massive clinical study, which does not exist to date. The claim is an example of viral botanical misinformation that lacks verifiable bibliographic references.

In recent seasons, several mainstream publications have enthusiastically repeated the supposed NASA study claiming 37 percent more sleep thanks to plants. I’ll admit that as soon as I read this, I opened academic databases to look for the DOI (Digital Object Identifier) of the original paper. I wanted to understand the protocol: how many participants? Which plant species? What sleep-monitoring equipment was used? The answer was silence. There is no document published by NASA or affiliated universities that cites this specific percentage.

The website bloomingexpert.com confirmed my suspicions, explicitly stating that the 37% claim is not based on a real study and does not appear in any peer-reviewed database. Experts from plants4presents.co.uk have pointed out that no scientific paper confirming this figure is available. It is probably a distortion of old data on stress or dust reduction, turned into a clickbait headline.

It’s not your fault you believed it. It’s written about in newspapers and shared on social media with eye-catching graphics. But now that you know, we can finally leave the marketing behind and see what serious scientific research actually says about the relationship between plants and a good night’s rest.

The three real mechanisms by which plants affect sleep

Plants affect sleep through leaf transpiration, which regulates humidity, the reduction of stress biomarkers through biophilic connection, and a limited but real biofiltration effect on volatile organic compounds in enclosed spaces.

1. The room’s humidity really does increase

One of the most tangible and measurable benefits relates to bedroom humidity. The study conducted by Jiang et al. in 2024, published in PLOS ONE (PMC11253968), provided extremely precise data. The researchers observed that adding 5 Boston ferns to an average-sized room (about 28-33 m²) can raise relative humidity from 29.3% to 38.9%.

Increasing the number of plants to 18 can bring humidity up to 49.2%. Why is this figure crucial for your sleep? The humidity range recommended by doctors for optimal rest is between 40% and 60%. When the air is too dry, especially in winter with the heating on, your respiratory mucous membranes become irritated, causing micro-awakenings, a dry throat, and greater susceptibility to allergens.

The University of Reading also confirmed the power of transpiration in a study published in the Journal of Building Engineering: a single medium-sized plant can release between 35 and 58 grams of water into the air per day. It’s a natural, silent, cost-free humidifier.

2. Less perceived stress, less cortisol (biophilia)

The second mechanism is psychophysiological and is known as biophilia. A systematic meta-analysis by Han, Ruan, and Liao (2022), published in the International Journal of Environmental Research and Public Health, analyzed 42 independent studies on human responses to indoor greenery.

The results are robust: simply looking at plants reduces diastolic blood pressure by an average of 2.5 mmHg and significantly improves cognitive performance by reducing mental fatigue. The concept of biophilia, introduced by E.O. Wilson in 1984, suggests that our nervous system is biologically programmed to relax in the presence of plant life. Seeing a living leaf activates the parasympathetic nervous system, lowering levels of cortisol, the stress hormone that is the main enemy of falling asleep.

Added to this is the release of phytoncides, such as alpha-pinene and linalool. These volatile molecules, studied extensively in the Japanese practice of shinrin-yoku (forest bathing), have been shown to increase natural killer cell activity and promote a state of deep calm.

3. The 1989 NASA case and why it doesn’t work the way you thought

We need to talk about the famous NASA Clean Air Study from 1989, conducted by B.C. Wolverton. Is it true that plants remove formaldehyde, benzene, and trichloroethylene? Yes, it is. But there’s a detail that’s often left out: the experiments were conducted in sealed, airtight chambers of about 1 cubic meter, just a little larger than an armchair.

A more recent study by Cummings & Waring of Drexel University (2020), which analyzed 196 experimental results, brought the findings back to real-world home conditions. In a real room, with natural ventilation and air infiltration, the plants' air-purifying capacity is "significantly overstated." To match the effectiveness of simply opening a window to air out the room, you'd need to cram between 10 and 1,000 plants per square meter into your bedroom. In a standard bedroom, that would mean living with 15,000 pots.

The honest conclusion? Plants help keep the air cleaner by absorbing small amounts of toxins, but they can't be considered the only air purification system.

What happens if you put 3-4 plants in your bedroom (an honest estimate)

With 3-4 well-chosen plants in an average bedroom, you can increase humidity by 5-10 percentage points, reduce perceived stress, and create a more regulated environment. The effect on deep sleep can't be precisely quantified, but has been documented as positive. It doesn't replace good sleep hygiene.

If you decide to turn your sleeping space into a little green oasis, here's what you can realistically expect:

• Controlled humidity — You'll notice less nasal dryness upon waking, measurable with a simple hygrometer.
• Visual calm — Looking at greenery before turning off the light will send signals of safety to your brain.
• Microclimate — The temperature around the bed will be slightly cooler and more stable thanks to transpiration.

However, it's important to be clear about what WON'T happen:

• You won't magically get 37% more REM sleep.
• The air won't become as pure as that on an alpine peak if you keep the windows closed all the time.
• Plants won't cure clinical conditions such as sleep apnea or chronic insomnia.

The 4 plants I recommend for the bedroom

The four plants recommended for the bedroom are Boston fern, snake plant, pothos, and bonsai ginseng ficus: the fern increases humidity, the snake plant tolerates low light and little water, pothos supports biophilia and biofiltration, and the ginseng ficus offers a care ritual that lowers cortisol before bed.

Over the years, in our laboratory, we have selected 4 varieties that best address the scientific mechanisms we discussed. They aren’t the only options, but they’re the ones our growers recommend for their balance of hardiness and benefits. Here are the plants that help you sleep by regulating the environment.

Boston fern (Nephrolepis exaltata)

It is the undisputed queen of humidity regulation. Thanks to its enormous leaf surface, made up of thousands of tiny fronds, the Boston fern is a natural humidifier. As we saw in the Jiang 2024 study, it is the most effective species for combating dry winter air.

Care and placement: It needs bright, filtered light (never direct sunlight, which burns its delicate leaves). Keep the soil consistently moist: it must never dry out completely. It loves high humidity, so avoid placing it on or near a switched-on radiator. The ideal minimum temperature is 15°C. I recommend hanging it or placing it on a high shelf so its fronds can trail freely.

Sansevieria trifasciata (Dracaena trifasciata)

Often called “mother-in-law’s tongue,” this plant is famous for its CAM (Crassulacean Acid Metabolism). Unlike most plants, Sansevieria opens its stomata at night to absorb CO2 and release oxygen. Although the amount is minimal, it’s the perfect ally for anyone still worried about the old myth of oxygen being stolen.

Care and placement: It is almost indestructible. It tolerates low light well, as is typical in many bedrooms, and requires very little water (once every 2-3 weeks is often enough). The minimum temperature is 10°C. Place it on a bedside table or in a less well-lit corner of the room: its sculptural, upright form adds a touch of modern design without taking up space.

Pothos (Epipremnum aureum)

Pothos primarily supports biophilia and biofiltration. It is one of the most effective plants for removing carbon monoxide and formaldehyde in small spaces. Its fast, lush growth offers a visual sign of vibrant nature that helps soothe your nerves after a hectic day.

Care and placement: It prefers indirect light but adapts to almost any conditions. Water it every 7-10 days, when the top inch of soil is dry. It tolerates the dry air of apartments well and can withstand temperatures down to 12°C. The ideal spot is a high shelf, allowing its leaves to create a green cascade that frames the sleeping area.

Ginseng ficus bonsai

This is where we enter the realm of biophilia tied to ritual. Caring for a small tree is a mindfulness practice that lowers cortisol before sleep. With its sculptural aerial roots, the ginseng ficus serves as a meditative focal point in the room.

Care and placement: It needs plenty of bright but indirect light. Water only when the soil is dry on the surface and maintain average humidity. The temperature must not drop below 15°C. Place it on the nightstand or dresser where it will be the first thing you see in the morning: starting the day with a miniature slice of forest has a documented impact on mood.

The 3 right questions to ask yourself BEFORE buying

Before buying, ask yourself whether you have enough natural light, where the radiator is, and how much time you can devote to watering: in low light, go for a snake plant, keep plants at least 1.5-2 meters from dry heat, and if you often forget to water, choose pothos or snake plant over Boston fern.

Before adding a new green companion to your nighttime sanctuary, assess the environmental conditions to ensure the plant not only survives but thrives, giving you the benefits you hope for. An unhappy plant won't help you relax.

1. Do I have enough natural light? Most bedroom plants need indirect light. If your room is very dark, go for a snake plant.
2. Where is the radiator? Direct dry heat is the number one enemy, especially for ferns. Make sure they're at least 1.5-2 meters away.
3. How much time do I have? If you tend to forget to water, avoid the Boston fern and choose pothos or snake plant.

The 4 best bedroom plants: light requirements and weekly care

Plant	Light requirements	Weekly care
Boston fern	High (indirect)	High (consistent humidity)
Snake plant	Low / Medium	Very low
Pothos	Medium	Medium
Ginseng ficus	High (indirect)	Medium

What NOT to expect from plants in the bedroom

Transparency is the value that has guided our company for three generations. Plants are wonderful living beings, not electronic devices. Don't expect a plant to cure chronic insomnia or replace an ergonomic mattress. Their contribution is subtle, cumulative, and environmental.

Plants won't eliminate allergens if you have a severe dust mite allergy, nor can they compensate for a lack of oxygen if you sleep in a completely sealed room without ever changing the air. Also, it's important to remember that the myth that plants in the bedroom steal oxygen is unfounded: their nighttime oxygen consumption is so infinitesimal that it has no impact on human respiration. Likewise, don't expect them to produce enough oxygen to alter the chemistry of the room. Their value lies in balance, not miracles.

Frequently asked questions

Do plants in the bedroom steal oxygen at night?

Absolutely not. This is one of the hardest indoor gardening myths to dispel. As confirmed by various scientific debunkings, including one by Repubblica in November 2025, the amount of oxygen a plant consumes at night is negligible. A person sleeping next to you or a pet consumes much more air than a forest of potted plants. You can sleep soundly.

How many plants do you need in your bedroom to feel an effect?

To achieve a measurable difference in humidity and a noticeable effect on stress levels, the ideal number is 3 to 5 well-spaced plants in a room measuring 15-20 square meters. A single plant has a mainly aesthetic and limited biophilic effect, while a small group creates a more stable, rejuvenating microclimate.

Does Sansevieria really produce oxygen at night?

Yes, Sansevieria uses CAM metabolism, which allows it to absorb carbon dioxide and release oxygen during the night to conserve water. However, the amount released is biologically small and does not significantly affect the concentration of oxygen available for humans to breathe. It's a fascinating botanical detail, but not respiratory therapy.

Are bedroom plants harmful to children?

Generally, no; in fact, they help regulate humidity in their rooms. However, avoid varieties that are highly toxic if ingested (such as Dieffenbachia) or plants with dangerous thorns. The four varieties recommended in this article — Fern, Sansevieria, Pothos, and Ficus — are safe, provided you keep the Ficus and Pothos out of reach of young children to prevent accidental ingestion of leaves.

Are real or artificial plants better?

If the goal is well-being and improved sleep, real plants are the only valid choice. Only living specimens activate leaf transpiration and release phytoncides. Artificial plants offer aesthetic value and a slight visual biophilic effect, but do not interact in any way with your bedroom's microclimate.

When is the best time to put plants in the bedroom?

The ideal time is autumn, between September and October. At this stage, turning on the heating starts to dry out the air in the home, and plants can immediately begin to act as natural humidifiers. In addition, introducing them at this time allows them to acclimate gradually before the peak of the winter cold.

Cultivate your rest

We have seen that science doesn't need invented percentages to confirm that living surrounded by greenery makes us feel better. Don't expect 37% more sleep, but do expect less dry air, a heart that beats a little more slowly at the sight of a lush Fern, and the pleasure of a daily ritual with your Ginseng Ficus. Nature works by subtraction: it reduces stress, dryness, and gloom. I invite you to explore our dedicated selection to find the ideal companions for your nights.