Why Does My Nose Switch Sides When I Lie Down?

Author: Op. Dr. Javidan Asafov · ENT / Otolaryngology Specialist · Last medical review: 27.10.2026

Why does the nose switch sides?

The turbinates lie along the side wall of each half of the nose. Beneath the lining that covers the turbinates and the septum (the wall that divides the nose down the middle) lies a sponge-like network of blood vessels that can fill with blood and empty again. When this network fills with blood, the turbinate swells and that side narrows; when it empties, the turbinate shrinks back and that side opens.

In many healthy people, this swelling and shrinking happens on the two sides in turn: while one side swells, the other side opens, and after a while the roles are reversed. This is called the nasal cycle. The cycle is regulated by the autonomic nervous system, which governs the body functions that work without our conscious control, such as the heartbeat and sweating. How long one side stays dominant varies greatly from person to person; studies have reported periods ranging from half an hour to several hours, and the cycle tends to last longer during sleep.

Because one side narrows while the other opens, the total amount of air passing through the nose usually changes little. This is why most people are not even aware of this cycle. The cycle does not follow the same pattern in everyone; in some people both sides swell and shrink together. These differences are also seen in healthy people.

What changes when you lie down?

When you lie on your side, the lower side of your nose tends to block and the upper side tends to open. This is thought to happen largely through a reflex that responds to the pressure on the lower side of the body; studies have shown that, in people lying on their back, applying pressure to one side of the torso also makes the nasal passage on that side narrow and the opposite side open. When you turn over onto your other side, it is often the new lower side that blocks and the upper side that opens. This is usually the “my nose is switching sides” feeling you notice at night.

Lying on your back also increases the swelling inside the nose somewhat compared with sitting or standing: when you lie down, the pressure in the veins of the head and neck rises and the turbinates become a little fuller. The cycle’s swings between swelling and shrinking may also become larger while you are lying down. In a healthy nose these differences are usually small; but because you pay more attention to your nose in the quiet of the night, while you are trying to fall asleep, they are easily noticed.

Why do some people notice it more?

The cycle itself is normal; what makes it noticeable is often that one or both sides of the nose are already narrow or swollen. In a healthy nose, when one side swells, the other side still lets air through easily. If one side is structurally narrow, then when the “good” side swells during the cycle, the narrow side cannot make up for it, and the nose feels completely blocked. The conditions that make this feeling more noticeable are:

• Deviated septum: A septum that is bent to one side narrows that side (deviated septum).
• Turbinate hypertrophy: When the turbinates are enlarged and do not shrink with medication, the normal swelling of the cycle comes on top of an airway that is already narrow (turbinate hypertrophy).
• Allergic rhinitis: Allergic inflammation makes the turbinates swell and can make the cycle’s swings larger (allergic rhinitis).
• Colds and sinusitis: During an infection the inside of the nose swells and the cycle becomes more noticeable; this eases as the cold clears up (sinusitis).
• Using decongestant nasal sprays: Decongestant nasal sprays only give short-term relief; with regular use, the nose becomes more blocked as the effect wears off (nasal spray addiction).
• Pregnancy: Hormonal changes can make the inside of the nose swell; this blockage usually clears up on its own after the birth.
• Dry air: In centrally heated or air-conditioned rooms, the inside of the nose dries out and the feeling of blockage may increase.

What helps?

• Raise your head slightly: Adding a pillow or raising the head of the bed a little can reduce the extra swelling that comes with lying on your back.
• Lie on the side that suits your nose: If one side of your nose is structurally narrow, lying on the narrow side, so that the more open side stays on top, often makes breathing easier. If there is no clear narrowing, any position you are comfortable in is fine.
• Rinse your nose with saline: This clears away secretions and allergens and moistens the inside of the nose. Use a ready-made solution, or one prepared with boiled and cooled or sterile water.
• Watch the humidity in the room: In a very dry room, raising the humidity in moderation can bring relief; too much humidity encourages mould.
• Have your allergy treated: If you have allergic rhinitis, the blockage is reduced by avoiding the allergen and following the regular treatment your doctor recommends.
• Do not rely on decongestant sprays: These sprays only give short-term relief; with regular use, they can make the nose more blocked (nasal spray addiction).

When to have it checked

A blockage that switches sides when you lie down is usually normal and nothing to worry about. If one side of your nose is always blocked regardless of your position, if the blockage affects your sleep and daily life, or if you snore or someone close to you has noticed that your breathing stops during sleep (snoring and sleep apnea), an examination is recommended. If you have repeated bleeding, or a bloodstained, foul-smelling discharge, from only one side of your nose, if your sense of smell has clearly decreased, or if you have pain or swelling in your face, do not put off an examination. During the visit, the inside of the nose is examined endoscopically with a thin camera; imaging such as a CT scan is not needed for everyone and is ordered only when necessary.

Does surgery stop the nasal cycle?

No, that is not the aim. The nasal cycle is a normal function and does not need treatment. If the symptoms are caused by a structural problem, such as a deviated septum or enlarged turbinates that do not shrink with medication, septoplasty or reducing the turbinates while preserving their function (turbinate reduction, for example with radiofrequency) may be among the options considered. The cycle usually continues after these procedures; in a study that examined the cycle before and after septoplasty, the cycle was found to continue after surgery and to be more evenly balanced between the two sides. Once the narrow side has been opened, the other side can still let air through when one side swells during the cycle, so the cycle is usually less noticeable than before.

This article is for general information; please consult your physician for diagnosis and treatment.