Blocked Nose at Night: Why It Happens and How to Fix It

Why is your nose more blocked at night?

Posture: lying flat raises pressure in the veins of the head and swells the turbinates (the structures inside the nose). The nose alternates congestion from side to side during the day (the “nasal cycle”), and lying on one side can make the lower nostril feel blocked.
Allergens in the bedroom: dust mites in mattresses and pillows, pet dander, moulds.
Dry or cold air, central heating and air conditioning.
Evening alcohol, which dilates blood vessels in the nasal lining.
Reflux: acid reaching the throat can swell the nasal lining and worsen congestion lying down.
Cold or sinus infection, where mucus pools at night.
Pregnancy, which causes “pregnancy rhinitis” in many women.

Conditions behind chronic night-time blockage

Allergic rhinitis: symptoms with sneezing, itchy eyes and a runny nose.
Non-allergic (vasomotor) rhinitis: triggered by temperature, smells and smoke.
Chronic rhinosinusitis, with or without polyps.
Deviated nasal septum or enlarged turbinates, which narrow the airway on one side.
Medication-induced rhinitis (rhinitis medicamentosa) from decongestant spray use over 3–5 days.
Enlarged adenoids in children.
Sleep-disordered breathing: blockage and snoring often go together.
Rarely, a tumour or foreign body, usually causing one-sided blockage.

What can help tonight

Saline rinse or spray 30 minutes before bed (use distilled, sterile or boiled-and-cooled water).
Prop up your head with an extra pillow or raise the head of the bed by 10–15 cm.
Take a warm shower or inhale steam before sleep.
Humidify the bedroom, keeping the humidifier clean; aim for 40–50% humidity.
Use an external nasal strip if the problem is valve collapse; it can help some people.
Avoid alcohol and heavy meals in the evening.
Short-term decongestant spray (no more than 3 nights) if a cold is the cause and you have no contraindication.
Sleep on your side with the more open nostril up; changing sides lets the lower one drain.

Make the bedroom allergy-friendly

Wash bedding weekly at 60 °C, use allergen-proof mattress and pillow covers, keep pets out of the bedroom, vacuum with a HEPA filter, reduce clutter and fabrics, and ventilate to prevent moulds. A daily nasal corticosteroid spray is the most effective medicine for allergic congestion and works best when used regularly; non-sedating antihistamines help sneezing and itching. The AAO-HNSF allergic rhinitis guideline recommends intranasal steroids for patients with moderate to severe symptoms.

Medicines: what to use and what to avoid

Nasal steroid sprays need 1–2 weeks to reach full effect. Antihistamines are best for allergic symptoms, but sedating ones can dry the nose and cause drowsiness. Decongestant sprays (oxymetazoline, xylometazoline) must not be used for longer than 3–5 days: repeated use can cause rebound congestion that is worse than the original problem. Oral decongestants can raise blood pressure and keep you awake, so avoid them in the evening if you have insomnia or heart conditions.

If you have been using a decongestant spray for weeks, stop gradually and ask your doctor or pharmacist for a plan to avoid rebound congestion.

Blocked nose in babies and children

Babies breathe mainly through their nose and may struggle to feed when blocked. Use saline drops before feeds and sleep, a nasal aspirator gently, a humid room and keep the baby upright when feeding. Do not use decongestant drops or sprays in babies. In older children, persistent night-time blockage with snoring, mouth breathing, restless sleep or poor concentration can be due to enlarged adenoids or allergy and merits an ENT assessment.

When an ENT assessment helps

See an ENT specialist if blockage persists beyond 4–6 weeks of treatment, affects only one side, comes with nosebleeds, loss of smell or facial pain, or if you also snore loudly or wake unrefreshed. The doctor can examine the nose with a small flexible camera, test for allergy and discuss treatments such as medicated sprays, treatment of polyps, or surgery to straighten the septum or reduce the turbinates when medical treatment fails.

Three common situations

Blocked every night but fine during the day, with sneezing in the morning: likely allergy to dust mites; allergen-proof the bedroom and use a nasal steroid.

One side always blocked for years, worse when lying on it: a deviated septum or turbinate swelling is likely; see an ENT.

Blocked nose and snoring since gaining weight: address the weight, avoid evening alcohol and consider a sleep assessment if sleepiness persists.

Key points to remember

Night-time congestion has an explanation and usually a fix. Rinse the nose, raise your head, make the bedroom allergy-friendly, treat allergy with a nasal steroid and avoid prolonged use of decongestant sprays. See an ENT if it is persistent, one-sided or associated with snoring or other warning signs.

This guide is for general information and does not replace an assessment by your own doctor or ENT specialist.

Questions about a blocked nose at night

These answers are general information and do not replace an examination or individual medical advice.

Why is my nose blocked only at night?

Lying down increases blood flow to the nasal lining, and bedroom allergens, dry air and alcohol can add to it.

How can I unblock my nose to sleep?

Rinse with saline, raise your head, use steam or a humidifier and, for a few days only, a decongestant spray if suitable.

Is it safe to use nasal spray every night?

Saline and steroid sprays are safe for regular use if directed. Decongestant sprays should not be used for more than 3–5 days.

Can reflux cause a blocked nose at night?

Yes. Reflux can irritate the throat and nose and worsen congestion when lying down.

Why does one nostril block and the other open?

The nasal cycle alternates swelling between sides; lying on one side can increase blockage in the lower nostril.

When should I see a doctor?

If blockage lasts more than 4–6 weeks, is one-sided, comes with nosebleeds or loss of smell, or with loud snoring and daytime sleepiness.

Sources

This guide is for general information and does not replace medical advice. How a problem is diagnosed and treated depends on your examination and medical history. If you think you have an emergency, contact your local emergency services.