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Sleep and breathing MediBilbao Salud

CPAP and Snoring: Does It Stop Snoring and Why You Might Still Snore

CPAP (continuous positive airway pressure) is the main treatment for moderate to severe obstructive sleep apnoea, and one of its first noticeable effects is that snoring stops. Partners often notice the difference on the first night. But some people still snore with CPAP, usually because the pressure, mask or fit needs adjusting. And CPAP is not the right treatment for everyone who snores. This guide explains, from an ear, nose and throat (ENT) and sleep point of view, how CPAP affects snoring, how to fix snoring on CPAP and the alternatives.

Topic
ENT
Updated
Reading time
5 minutes
Reviewed by
Dr. Itziar Gotxi Erezuma · Medical doctor (ENT) · Bizkaia Medical Association no. 484809757

How CPAP works

In obstructive sleep apnoea, the soft palate, tongue and throat walls collapse during sleep, partially or completely blocking the airway. Partial narrowing causes snoring; complete blockage causes apnoeas. A CPAP machine pumps room air through a tube and mask at a set pressure that acts like an air splint, keeping the airway open throughout the night. Many modern machines adjust the pressure automatically and record data on leaks, residual events and usage.

Does CPAP stop snoring?

Yes, when it is set correctly and used every night, CPAP stops snoring in most people, because the vibrating tissues no longer meet a narrow airway. Bed partners usually sleep better too. However, CPAP only works while it is on: snoring returns on nights without it or after taking the mask off during the night.

Why you might still snore with CPAP

  • Pressure too low: the airway is not kept fully open, especially on your back or after alcohol.
  • Mask leaks: air escapes, reducing effective pressure, often with a whistling noise.
  • Mouth opening with a nasal mask: air escapes through the mouth.
  • Blocked nose from allergies, a deviated septum or enlarged turbinates.
  • Weight gain since the pressure was set.
  • Alcohol or sedatives that relax the throat further.
  • An old or damaged mask or cushion.

How to stop snoring on CPAP

  • Ask your sleep clinic to review the machine data and adjust the pressure.
  • Try a different mask type or size; full-face masks help mouth breathers.
  • Add a chin strap if your mouth falls open with a nasal mask.
  • Use heated humidification to reduce nasal dryness and congestion.
  • Treat nasal blockage with saline rinses or a steroid spray, or see an ENT if it is structural.
  • Replace cushions and masks as recommended.
  • Avoid alcohol in the evening and sleep on your side if possible.

Snoring without sleep apnoea: is CPAP needed?

CPAP is not usually prescribed for simple snoring, meaning snoring without significant sleep apnoea. A sleep study distinguishes the two. Simple snoring is treated with weight loss, side sleeping, avoiding alcohol, treating the nose, a mandibular advancement device made by a dentist and, in selected cases, surgery of the nose, palate or tonsils. See snoring remedies and snoring with mouth closed.

Alternatives to CPAP for sleep apnoea

  • Mandibular advancement devices for mild to moderate apnoea or CPAP intolerance.
  • Positional therapy when apnoea occurs mostly on the back.
  • Weight loss and exercise.
  • Surgery of the nose, tonsils, palate or jaw in selected patients.
  • Hypoglossal nerve stimulation in selected people with moderate to severe apnoea who cannot use CPAP.

Getting used to CPAP

  • Wear the mask while awake for short periods to get used to it.
  • Use the ramp function that starts at a low pressure.
  • Make sure the mask fits without being too tight.
  • Address dryness, nasal blockage or skin irritation early.
  • Use it all night, every night; benefits on sleepiness, mood and blood pressure depend on regular use.

What bed partners should know

Bed partners are often the first to notice snoring, pauses in breathing or gasping, and their observations are valuable for the sleep team. If snoring returns after starting CPAP, a partner may notice that it happens when the mask comes off during the night or when sleeping on the back. Some CPAP machines make a soft noise or leak air; a well-fitted mask and a quieter modern machine usually solve this. Earplugs or a white noise device can help partners during the first weeks while settings are adjusted. Recording a short audio clip of the snoring can help the clinician decide what to change.

When to contact your sleep team

  • Snoring, gasping or daytime sleepiness return despite using CPAP.
  • You cannot tolerate the mask or pressure.
  • Persistent nasal blockage, nosebleeds or dry mouth.
  • Significant weight change since starting treatment.

Key points to remember

  • CPAP stops snoring by keeping the airway open.
  • Snoring on CPAP usually means the pressure or mask needs adjusting.
  • CPAP is for sleep apnoea; simple snoring has other treatments.
  • A sleep study tells snoring and sleep apnoea apart.

Questions about CPAP and snoring

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

Does CPAP stop snoring completely?

In most people, yes, when the pressure and mask are right and it is used all night.

Why am I snoring with my CPAP on?

The pressure may be too low, the mask may leak, the mouth may open with a nasal mask, or the nose may be blocked.

Can I use CPAP just for snoring?

CPAP is generally prescribed for sleep apnoea. Simple snoring is usually treated in other ways.

Can a chin strap help snoring on CPAP?

Yes, if the mouth falls open with a nasal mask. A full-face mask is another option.

How quickly does CPAP stop snoring?

Usually from the first night once the settings are correct.

Is a mouthguard as good as CPAP for snoring?

Mandibular advancement devices work well for snoring and mild to moderate apnoea, but CPAP is more effective for severe apnoea.

Sources

  1. NHS · Obstructive sleep apnoea
  2. NHS · Snoring
  3. AASM Sleep Education · CPAP
  4. Patil SP, et al. Treatment of adult obstructive sleep apnea with positive airway pressure: an AASM clinical practice guideline. J Clin Sleep Med. 2019

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.