Why is my nose stuffy at night in summer? Causes and fixes

A stuffy nose at night in summer usually comes down to what's in your bedroom air: pollen drifting in through open windows, dust mites multiplying in the humidity, chlorine from a day at the pool, or air conditioning that leaves the air too dry. Lying down then makes whatever's there feel worse. The good news is that most of these causes have simple fixes.

If your nose gets blocked at night all year round, our main guide to why your nose gets stuffy at night covers the full list. This one focuses on the summer culprits.

Why does a stuffy nose feel worse at night?

A stuffy nose feels worse at night largely because of your position. A 2022 meta-analysis pooled nine studies and found that lying down increases nasal resistance and reduces airflow through the nose. The effect was larger in people who snore or have sleep apnea than in healthy volunteers.

Cleveland Clinic adds that when you lie down, your body can't drain mucus as effectively. So a mild daytime irritation from pollen or dry air can turn into a properly blocked nose once you're in bed. Summer adds a few triggers of its own on top of that.

Is it summer pollen?

Pollen is one of the most likely causes of a summer stuffy nose, and the timing of your symptoms can give it away. The American College of Allergy, Asthma and Immunology (ACAAI) says grass pollinates later in the spring and summer, and ragweed in the late summer and fall. It says ragweed releases pollen from August to November, with levels highest in early to mid-September in many parts of the US.

Time of day matters too. The ACAAI says that during tree and grass pollen season, levels are highest in the evening. In late summer and early fall, during ragweed season, they're highest in the morning. A warm summer evening with the windows open, just as grass pollen peaks, is a recipe for a blocked nose at bedtime.

What helps, according to the ACAAI:

• Keep windows and doors shut at home and in the car during allergy season.
• Shower, wash your hair and change your clothes after time outdoors.
• If you get symptoms at the same time every year, allergists recommend starting allergy medicine about two weeks before they usually begin.

Our guide to allergies that get worse at night goes further.

Can air conditioning make your nose stuffy?

Air conditioning can affect your nose because it changes the humidity in your bedroom, and humidity matters in both directions. The American Lung Association says air conditioning and dehumidifiers help draw moisture out of the air, which is useful in humid areas. But air that ends up too dry can be a problem of its own. Cleveland Clinic says dry air can irritate your nose and lungs.

The target is a middle range. The EPA recommends keeping indoor humidity between 30% and 50%, and warns that levels above 50% may encourage the growth of biological organisms such as dust mites and mold. A hygrometer, sold at hardware stores, tells you where your bedroom actually sits.

If the air in an air-conditioned room is reading below 30% and your nose feels dry or crusty, a humidifier set to stay under 50% can help. Clean it often. The EPA advises emptying the tank, wiping it dry and refilling portable humidifiers daily, and using low-mineral water such as distilled water. Our humidifier guide covers this in more detail.

Are dust mites worse in summer?

Dust mites tend to be worse in warm, humid conditions, which describes a lot of summer bedrooms. The American Lung Association says dust mites thrive in warm, humid settings, and that humidity is the most important factor in how many live in a house. They don't drink water. Instead, they absorb moisture from the air, so they can't survive in low humidity.

People who react to dust mites are reacting to proteins in their droppings and remains, not the mites themselves. And because bedding is one of their favorite places, the bedroom is where exposure is highest.

The fixes, from the American Lung Association and the American Academy of Allergy, Asthma & Immunology (AAAAI):

• Keep indoor humidity below 50%, using air conditioning or a dehumidifier in humid weather.
• Wash bedding weekly in hot water. The AAAAI suggests 130°F and drying in a hot dryer.
• Cover mattresses, box springs and pillows in allergen-proof or zippered covers.
• Cut down on clutter, and wash stuffed toys regularly in hot water.

Can a bedroom fan make congestion worse?

No study has tested whether bedroom fans cause a stuffy nose, so there's no clear answer. A fan doesn't add pollen or dust on its own, but it does keep air moving across your face and around the room, and it can stir up whatever has settled on surfaces.

If you're stuffier on fan nights, a few low-effort changes are worth trying. Dust the fan blades, point it away from your face, and don't place it in front of an open window on high-pollen evenings.

Can chlorine from swimming pools cause a stuffy nose?

Chlorine from swimming pools can irritate the nose, especially if you swim often. Researchers think by-products of pool chlorine are to blame. Most of the research is in competitive swimmers, who spend hours a day in indoor pools.

In a 2010 study, 74% of competitive swimmers reported nasal symptoms during intense training, compared with 40% of people who didn't swim. After at least two weeks without swimming, the swimmers' symptoms were similar to everyone else's. The researchers concluded the symptoms probably came from exposure to chlorine by-products rather than seasonal allergies.

A 2012 study of 54 swimmers aged 9 to 21 with nasal symptoms tested a simple fix. Wearing a nose clip while swimming for a month reduced nasal inflammation and nasal resistance in swimmers whose symptoms came from irritation, and also improved symptoms in those with allergies. If summer swimming leaves you stuffy, a nose clip in the pool and a saline rinse afterward are both easy to try. See how to use a saline rinse.

How can you tell which summer trigger it is?

You can often tell which summer trigger is behind your stuffy nose by when it happens. Keeping a simple note for a week or two of when your nose blocks up, what the weather was like and what you did that day usually points to one or two likely causes. This table pulls together the clues from the sections above.

More than one can be true at once. A humid August night with the windows open could bring pollen and dust mites together. If you can't pin it down, or your symptoms last for weeks, an allergist can test for specific allergies.

How do you stop a stuffy nose at night in summer?

You can usually ease a summer stuffy nose at night with a handful of bedtime changes. These come from Cleveland Clinic, the ACAAI and the EPA, and they cover most of the causes above:

• Raise your head and shoulders with an extra pillow or a wedge, since lying flat increases nasal resistance.
• Shower before bed to rinse off pollen from the day.
• Change your sheets weekly, and keep pets out of the bedroom.
• Use a saline spray or rinse to clear mucus and allergens.
• Check your bedroom humidity and aim for 30% to 50%.
• Close the windows on evenings when pollen is high.

A nasal strip is another drug-free option for the nights your nose is still blocked. In a 2018 randomized, placebo-controlled trial, 59 people with chronic nighttime congestion and sleep difficulties wore a nasal strip or a placebo strip each night for two weeks. The real strips improved some measures of congestion and sleep compared with placebo. We explain how to get the most from them in best nasal strips for congestion.

If home fixes don't help, Cleveland Clinic advises seeing a healthcare provider. A pharmacist can also help you choose between allergy medicines and sprays; our guide to types of nasal spray explains the options. And if you snore loudly with choking or gasping at night, see a doctor.

Our pick (paid partner): TitanAir Nasal Strips

For a drug-free option on stuffy summer nights, our pick is TitanAir Nasal Strips. This is our recommendation, not the result of testing or ranking products ourselves.

Titan says the strips are drug-free external nasal dilators with flexible spring-loaded bands. Titan's directions are to place a strip just above the flare of the nostrils, on the soft part of the nose rather than the bony bridge, on clean, dry skin with no moisturizer, which is worth remembering on hot nights when skin is damp. To remove one, Titan suggests loosening it with warm water and peeling slowly from the ends inward. Titan says every batch is third-party tested and certified PFAS-free, and it offers a 30-night guarantee.

Read next

• Why is my nose stuffy at night?
• How to unblock your nose before bed
• Decongestants for a stuffy nose at night

* This content is for informational and educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure or prevent any disease or health condition. Talk to a qualified healthcare provider about your health.