Why does your nose become more blocked when you lie down?

Many people notice that their nose becomes more blocked when they lie down in the evening. They may breathe relatively freely while sitting or walking, but shortly after their head touches the pillow, one or both nostrils become narrower. Some people also notice that the congestion switches sides when they turn over in bed.

⠀

This often happens because lying down changes how blood is distributed through the body and makes it easier for the lining of the nose to swell. Gravity no longer helps move blood and tissue fluid away from the head in the same way as when you are standing. At the same time, the nasal cycle, allergies, colds, dry air, reflux, and anatomical factors may make the congestion more noticeable.

⠀

The lining of the nose can swell

The inside of the nose is covered by a mucous membrane containing many blood vessels. This lining warms, humidifies, and filters the air before it continues towards the lungs.

⠀

The blood vessels in the mucous membrane can dilate and constrict. When they dilate, the tissue fills with more blood, and the nasal passages become narrower. This is often referred to as swelling of the nasal lining or nasal congestion.

⠀

When you lie down, more blood may remain in the area around the head and nose. This can cause the mucous membrane to swell slightly more than when you are upright.

⠀

The result may include:

⠀

• Narrower nasal passages

• Increased resistance to breathing

• More mouth breathing

• A feeling of pressure in the nose

• Congestion that alternates between the nostrils

• More snoring

⠀

In someone with completely healthy nasal membranes, this effect may be mild. If the lining is already irritated by an allergy or a cold, the difference may become much more noticeable.

⠀

Gravity affects blood distribution

When you stand or sit, gravity causes more blood to remain in the lower parts of the body. When you lie flat, blood is distributed differently, and more blood returns towards the chest, neck, and head.

⠀

This change may increase blood filling in the nasal lining. Because the nasal passages are already relatively narrow, only a small amount of swelling is needed before airflow feels reduced.

⠀

A small change in the thickness of the mucous membrane can therefore make a large difference to how easily air passes through the nose.

⠀

This is also one reason why slightly elevating the head may help. Gravity can then reduce some of the blood filling and fluid accumulation in the nasal lining.

⠀

The nasal cycle often makes one nostril more blocked

The nose has a natural rhythm in which the mucous membrane alternates between being more swollen on one side and then the other. This is called the nasal cycle.

⠀

In most people, this alternation happens automatically through the autonomic nervous system. One nostril has slightly freer airflow, while the lining on the other side contains more blood. After a while, the sides switch roles.

⠀

The nasal cycle is normal and probably allows the nasal lining to alternate between different working conditions. People usually do not notice it, but it becomes more obvious during a cold, with allergies, or when lying in bed.

⠀

The nasal cycle may cause:

⠀

• Congestion mainly on one side

• Congestion that changes sides during the night

• A feeling that one nostril opens as the other becomes blocked

• More noticeable symptoms when lying on one side

• Normal variation without disease

⠀

Congestion that switches sides does not therefore necessarily mean that something is wrong.

⠀

Side sleeping can block the lower nostril

When you lie on your side, the nostril closest to the mattress often becomes more blocked. This is partly caused by increased blood filling and pressure on the lower side.

⠀

When you lie on your right side, the right nostril may become narrower. If you turn onto your left side, the left nostril may gradually become more blocked while the right side opens.

⠀

This response is related to the nasal cycle and the autonomic nervous system’s regulation of the blood vessels inside the nose.

⠀

The effect may be particularly noticeable if you have:

⠀

• A deviated nasal septum

• Allergic rhinitis

• A cold

• Enlarged nasal turbinates

• Chronic irritation of the nasal lining

• Nasal polyps

⠀

For many people, simply changing sleeping position is enough to improve airflow through the upper nostril.

⠀

The nasal turbinates regulate airflow

Structures known as nasal turbinates are located along the side walls of the nose. They consist of bone covered by a blood-rich mucous membrane.

⠀

The turbinates perform important functions. They increase the surface area inside the nose and help warm, humidify, and clean inhaled air. At the same time, they can swell and reduce the available space inside the nasal passages.

⠀

When the blood vessels in the turbinates fill, airflow becomes more restricted. When the blood filling decreases, the nose opens again.

⠀

With chronic irritation, the turbinates may remain enlarged over time. A person may then feel blocked both during the day and at night, although the congestion is often worse when lying down.

⠀

A cold often feels worse at night

During a cold, the nasal lining is irritated by a viral infection. The body increases blood flow and activates the immune system in the area. This causes swelling, mucus production, and increased sensitivity.

⠀

When you lie down, position-related swelling is added to the swelling caused by the infection. The nose may therefore feel much more blocked at night.

⠀

A cold may cause:

⠀

• A blocked or runny nose

• A sore throat

• Coughing

• Sneezing

• Pressure in the face

• Reduced sense of smell

• Mild fever or a general feeling of illness

⠀

Mucus may also collect towards the back of the throat when you are lying down. This can trigger coughing or a need to clear the throat.

⠀

This does not necessarily mean that the cold is genuinely becoming worse at night. The symptoms may simply be more noticeable because body position, dry air, and reduced distraction affect the experience.

⠀

Allergies may become more noticeable in bed

Allergic rhinitis occurs when the immune system reacts to substances such as pollen, dust mites, animal dander, or mould. The reaction may cause swelling, itching, sneezing, and a runny nose.

⠀

If the allergen is present in the bedroom or bedding, symptoms may increase when you lie down.

⠀

Common bedroom triggers include:

⠀

• Dust mites in mattresses and bedding

• Animal dander

• Dust

• Mould

• Pollen brought inside through windows or on clothing

• Fragranced products and cleaning products

⠀

With dust mite allergy, symptoms are often pronounced at night and in the morning. A person may wake with a blocked nose, sneeze frequently, or feel that the nose takes time to open after getting up.

⠀

Dry air can irritate the nasal lining

Dry indoor air can make the nose more irritated. The mucous membrane needs moisture to function properly. When the air is dry, the surface may dry out, and the body may respond with irritation, increased mucus production, or a sensation of congestion.

⠀

This is common in:

⠀

• Heated rooms during winter

• Air-conditioned rooms

• Bedrooms with strong ventilation

• Cold and dry periods

• Rooms with low humidity

⠀

Dryness may cause:

⠀

• A burning sensation in the nose

• Crusting

• Nosebleeds

• A feeling of congestion

• A frequent need to blow the nose

• Throat irritation

⠀

Some people find saline nasal spray or nasal irrigation helpful. A humidifier may help in very dry air, but it must be cleaned thoroughly to prevent bacterial or mould growth.

⠀

Mouth breathing can worsen the problem

When the nose becomes blocked, many people begin breathing through the mouth. This may provide enough airflow, but mouth breathing can dry the mouth and throat.

⠀

This may cause:

⠀

• Dry mouth in the morning

• A sore throat

• Bad breath

• Increased thirst

• Restless sleep

• More snoring

• Frequent awakenings

⠀

Mouth breathing temporarily solves the airflow problem but may create other symptoms.

⠀

If you wake with a very dry mouth every morning, night-time nasal congestion may be one possible explanation. Snoring, sleep apnoea, and certain medications may also contribute.

⠀

A deviated nasal septum can make one side narrower

The nasal septum divides the nose into a right and left side. In many people, it is slightly uneven without causing any problems. If the deviation is more pronounced, one nostril may be narrower than the other.

⠀

When the nasal lining swells in a lying position, the already narrow side often becomes even more restricted. People with a deviated septum may therefore notice a substantial difference between daytime and night-time breathing.

⠀

Possible signs include:

⠀

• Persistent congestion mainly on one side

• Difficulty breathing through the nose during exercise

• Frequent mouth breathing

• Snoring

• Sleep problems

• Recurrent sinus problems

• Congestion that does not disappear between colds

⠀

A deviated septum does not need treatment if it causes few symptoms. If breathing difficulties are pronounced, a doctor or ear, nose, and throat specialist can assess the condition.

⠀

Enlarged nasal turbinates can cause chronic congestion

The nasal turbinates may become enlarged because of long-term allergies, irritation, or overuse of decongestant nasal sprays. The nasal passages may then remain narrow for much of the time.

⠀

Typical symptoms may include:

⠀

• Persistent nasal congestion

• Congestion that alternates between sides

• Reduced sense of smell

• Mouth breathing

• Snoring

• A feeling of pressure inside the nose

• A perceived need for nasal spray

⠀

Enlarged turbinates can often be treated by addressing the underlying cause, such as treating allergies or using a corticosteroid nasal spray. Surgery may sometimes be considered if the symptoms are severe and persistent.

⠀

Decongestant nasal spray can create a vicious cycle

Decongestant nasal sprays can quickly open the nose by constricting blood vessels in the nasal lining. They may be helpful during a short-term cold but should not be used continuously for prolonged periods.

⠀

With long-term use, the mucous membrane may respond with increased swelling when the effect wears off. This is often called medication-induced rhinitis or rebound congestion.

⠀

A person may then experience:

⠀

• The nose opening after using the spray

• The effect lasting for a shorter time

• Congestion becoming worse when the spray wears off

• An increasing need for the spray

• The nose feeling constantly blocked without the product

⠀

This cycle can make night-time congestion particularly troublesome. After prolonged use, tapering and alternative treatment should be discussed with a doctor or pharmacist.

⠀

Corticosteroid nasal sprays work differently and do not produce the same immediate opening effect. They are often used for allergies and chronic swelling of the nasal lining but usually need to be used regularly over time for their full effect.

⠀

Reflux can irritate the nose and throat

In some people, stomach acid and stomach contents may move upwards into the oesophagus, particularly when lying down. This is known as reflux.

⠀

Reflux does not always cause typical heartburn. Some people mainly experience throat irritation, coughing, hoarseness, a sensation of mucus, or a frequent need to clear the throat.

⠀

Possible night-time symptoms include:

⠀

• A sour taste in the mouth

• Heartburn

• Coughing

• Hoarseness in the morning

• A lump sensation in the throat

• A blocked or irritated nose

• Frequent throat clearing

⠀

Reflux is not the most common cause of nasal congestion, but it may contribute to irritation of the upper airways in some people.

⠀

Large meals late in the evening, alcohol, and lying down immediately after eating may make reflux more likely.

⠀

Pregnancy can increase nasal congestion

Hormonal changes during pregnancy can affect blood vessels and mucous membranes. Some people develop pregnancy rhinitis, which causes nasal congestion without a cold or allergy.

⠀

The congestion may become more noticeable when lying down because hormonally related swelling of the nasal lining combines with changes in blood distribution.

⠀

Pregnancy-related nasal congestion may cause:

⠀

• Congestion during much of the day

• Worsening at night

• Snoring

• Mouth breathing

• Poorer sleep

• Dry mouth

⠀

Saline products, elevating the head, and improving the bedroom environment may help. Medications during pregnancy should be discussed with a doctor, midwife, or pharmacist.

⠀

Alcohol can make the nose more blocked

Alcohol can dilate blood vessels and affect mucous membranes. In some people, this causes increased nasal congestion, particularly when alcohol is consumed during the evening.

⠀

Alcohol may also:

⠀

• Worsen snoring

• Reduce muscle tone in the upper airways

• Disrupt sleep quality

• Increase reflux

• Worsen allergy-like reactions in some people

⠀

If you notice that your nose becomes significantly more blocked after drinking alcohol, it may be a contributing factor.

⠀

Certain foods and histamine may play a role

Some people experience a blocked or runny nose after spicy foods, hot meals, or alcohol. This does not necessarily indicate an allergy. It may be caused by a nervous system reflex that increases mucus production.

⠀

When symptoms are triggered by food, this is often called gustatory rhinitis.

⠀

Some people also react to histamine-rich foods or alcohol, but symptoms vary considerably and do not always indicate a medical histamine intolerance.

⠀

If congestion mainly occurs after specific meals and becomes more noticeable when you lie down, the timing and type of food may be relevant.

⠀

Elevating the head can make breathing easier

Slightly elevating the head and upper body may reduce blood filling and fluid accumulation in the nasal lining. It may also help if reflux contributes to the symptoms.

⠀

Practical ways to elevate the head include:

⠀

• Using an additional supportive pillow

• Raising the head end of the bed

• Using a wedge pillow

• Avoiding a completely flat position when symptoms are severe

⠀

For many people, a moderate elevation is sufficient. Too many or excessively high pillows may instead cause neck discomfort.

⠀

It is often better to elevate the upper body evenly than to bend the neck sharply forwards.

⠀

Saline can clean and moisturise the nose

Saline nasal spray or nasal irrigation may help with dryness, mucus, allergens, and mild congestion. Saline does not constrict blood vessels in the same way as decongestant sprays and therefore does not carry the same risk of rebound congestion.

⠀

Saline may help to:

⠀

• Moisturise the nasal lining

• Loosen thick mucus

• Rinse away pollen and dust

• Reduce crusting

• Make the nose feel more comfortable

• Improve the effect of other nasal treatments

⠀

When using nasal irrigation, the water and equipment must be hygienic. Use a prepared sterile product or water that is suitable and treated according to recommendations for nasal rinsing.

⠀

Allergy treatment can reduce night-time congestion

If allergy is the main cause, treating the allergy is often more effective than using short-term decongestant sprays.

⠀

Relevant measures may include:

⠀

• Reducing exposure to the allergen

• Washing bedding regularly

• Keeping pets out of the bedroom

• Showering or changing clothes after high pollen exposure

• Using antihistamines when appropriate

• Using a corticosteroid nasal spray as recommended

• Keeping the bedroom clean and well ventilated

⠀

Corticosteroid nasal sprays must be used correctly and regularly for the best effect. The nozzle should usually be directed slightly outwards towards the ear rather than directly at the nasal septum to reduce irritation and nosebleeds.

⠀

Snoring and sleep apnoea may be related to nasal congestion

Nasal congestion may increase breathing resistance and contribute to mouth breathing and snoring. It is rarely the only cause of sleep apnoea, but it may make night-time breathing more difficult.

⠀

Signs that may indicate sleep apnoea include:

⠀

• Loud snoring

• Observed pauses in breathing

• Gasping or choking sensations during the night

• Morning headaches

• Pronounced daytime sleepiness

• Difficulty concentrating

• Frequent awakenings

• Dry mouth in the morning

⠀

These symptoms should be medically assessed. Treating nasal congestion may improve comfort, but sleep apnoea requires a separate evaluation.

⠀

When is night-time congestion usually harmless?

The nose becoming slightly more blocked when lying down is often normal. This is particularly common when the congestion alternates between sides, remains mild, and improves when you get up.

⠀

A typically harmless pattern includes:

⠀

• Congestion occurring mainly when lying down

• One nostril being more blocked than the other

• Congestion switching sides when you turn over

• Breathing improving when you stand up

• No severe pain or bleeding

• Symptoms varying from day to day

⠀

This often fits with the normal nasal cycle and position-dependent swelling of the nasal lining.

⠀

When should nasal congestion be assessed?

Persistent or pronounced nasal congestion should be assessed if it affects sleep, breathing, smell, or quality of life.

⠀

Contact a doctor if you experience:

⠀

• Persistent congestion lasting several weeks

• Congestion occurring almost entirely on one side

• Recurrent nosebleeds

• A reduced or absent sense of smell

• Severe facial pain

• Fever and a clear feeling of illness

• Foul-smelling discharge

• Swelling around the eye

• Snoring accompanied by pauses in breathing

• Persistent use of decongestant nasal spray

• Suspected nasal polyps or a foreign object

⠀

One-sided congestion that does not alternate, particularly when accompanied by bleeding or pain, should be investigated.

⠀

What can you do yourself?

Mild night-time congestion can often be reduced with simple measures.

⠀

Practical advice includes:

⠀

• Elevate the head or upper body slightly

• Use saline spray for a dry or irritated nose

• Treat known allergies

• Keep the bedroom clean and cool

• Avoid smoke and strong fragrances

• Limit alcohol late in the evening

• Avoid large meals immediately before bed if reflux is a problem

• Do not use decongestant nasal spray longer than recommended

• Change sides if one nostril becomes very blocked

⠀

The measure should be chosen according to the cause. Saline has limited effect on a clearly deviated nasal septum, while surgery is rarely necessary for a normal nasal cycle.

⠀

Common misconceptions

The nose does not necessarily become more blocked because more mucus accumulates. Swelling of the blood-rich nasal lining is often more important.

⠀

Congestion that switches between the nostrils is common. It may be caused by the normal nasal cycle.

⠀

Decongestant nasal spray is not suitable for prolonged daily use. Overuse may make the congestion worse.

⠀

Night-time nasal congestion is not always caused by a cold. Allergies, anatomy, dry air, reflux, and blood distribution may contribute.

⠀

More mouth breathing does not necessarily mean that the lungs are receiving too little air. However, it may cause dry mouth, snoring, and poorer sleep comfort.

⠀

Summary

The nose often becomes more blocked when you lie down because the position changes blood distribution and makes it easier for the blood-rich nasal lining and turbinates to swell. The normal nasal cycle may cause one nostril to become more blocked than the other, particularly when lying on one side. Colds, allergies, dry air, a deviated nasal septum, enlarged turbinates, reflux, and prolonged use of decongestant nasal sprays may intensify the symptoms. Elevating the head, using saline, treating allergies, and maintaining a suitable sleeping environment may help. Persistent one-sided congestion, nosebleeds, severe pain, reduced sense of smell, or snoring with pauses in breathing should be assessed by a healthcare professional.

⠀

Sources

• Eccles R. A role for the nasal cycle in respiratory defence. European Respiratory Journal. 1996;9(2):371–376.

• Kahana-Zweig R, Geva-Sagiv M, Weissbrod A, Secundo L, Soroker N, Sobel N. Measuring and characterizing the human nasal cycle. PLOS ONE. 2016;11(10):e0162918.

• Hellings PW, Klimek L, Cingi C, Agache I, Akdis C, Bachert C, et al. Non-allergic rhinitis: position paper of the European Academy of Allergy and Clinical Immunology. Allergy. 2017;72(11):1657–1665.