If you can't breathe through your nose at night you may have a stuffy nose, deviated septum, nasal congestion or other nasal obstruction.
Or you may also have Sinusitis.
Sinusitis is an inflammation of the sinuses that can cause them to get blocked and filled with fluid.
It is usually caused by cold or allergies.
An infection could result from the blockage.
When you have a blocked nose you should sleep with your head up propped on an extra pillow or two.
As you sleep, mucus doesn't drain as effectively.
That makes the nose even more blocked.
So, the best way to sleep with a blocked nose is to prop your head up on an extra pillow or two.
Also, it's best to sleep on your side if you can as lying on your back could make things worse.
Other ways to sleep with a blocked nose include.
Try bedding covers.
Place a humidifier in your room.
Use nasal saline rinse or spray.
Run an air filter.
Wear a nasal strip during sleep.
Drink plenty of water, but avoid alcohol.
Take your allergy medicine at night.
A stuffy or congested nose occurs when the tissues lining it become swollen.
The swelling is due to inflamed blood vessels.
problem may also include nasal discharge or "runny nose."
If excess mucus runs down the back of your throat (postnasal drip), it may cause a cough or sore throat.
Nasal congestion can be caused by anything that irritates or inflames the nasal tissues.
Infections such as colds, flu or sinusitis and allergies are frequent causes of nasal congestion and runny nose.
Sometimes a congested and runny nose can be caused by irritants such as tobacco smoke and car exhaust.
When you lie down, your blood pressure changes.
And blood flow to the upper part of your body can increase, including the blood flow to your head and nasal passageways.
This increased blood flow can inflame the vessels inside your nose and nasal passages, which can cause or worsen congestion.
If your nasal congestion is from a cold or flu, it will likely last as long your cold or flu (anywhere from five to 10 days) or even longer.
If your nasal congestion is the result of allergies, it may last longer, depending on your exposure to that particular allergen.
A blocked or stuffy nose typically lasts from 5 to 10 days.
You can help get rid of a stuffy or blocked nose by using a saline solution such as with a Neti Pot or even take a steamy hot shower.
The steam from the hot shower can help open up your nasal passages to help get rid of your stuffy or blocked nose.
Taking a decongestant and staying hydrated and using a humidifier can also help with blocked noses.