Loud snoring may seem harmless, or perhaps just an irritation for a partner, but for many Australians, it’s a red flag for something more serious. Snoring, especially when accompanied by tiredness, poor sleep quality, or observed pauses in breathing, can signal the presence of sleep apnoea.
Many people first seek help for snoring or fatigue, only to discover that their disrupted sleep patterns are linked to cardiovascular concerns. Understanding the connection between sleep disorders and heart health can be the key to improving both well-being and long-term outcomes.
Snoring and Sleep Apnoea — What’s the Connection?
Not all snoring is dangerous. However, when snoring becomes loud, persistent, and accompanied by gasping or pauses in breathing, it may indicate obstructive sleep apnoea (OSA).
OSA occurs when the muscles of the throat relax during sleep, causing the airway to narrow or close. This interrupts breathing, sometimes hundreds of times a night, leading to reduced oxygen levels and repeated awakenings. The result is fragmented sleep, excessive daytime sleepiness, headaches, and, in many cases, a significant strain on the heart.
There’s also another, less common type called central sleep apnoea (CSA). Unlike OSA, where the problem is physical obstruction, CSA happens when the brain fails to send regular breathing signals to the muscles. This is often seen in people with heart failure or damage to the heart muscle following a heart attack.
The Heart-Sleep Relationship
When breathing repeatedly stops and starts during sleep, oxygen levels in the blood drop. The body responds by releasing stress hormones, constricting blood vessels, and raising heart rate and blood pressure. Over time, this constant “fight or flight” activation can damage blood vessels and increase the risk of:
- High blood pressure (hypertension)
- Atrial fibrillation (irregular heart rhythm)
- Heart failure or recurrent heart attack
Obstructive sleep apnoea can worsen existing cardiac conditions or slow recovery after a heart event. That’s why cardiologists frequently refer patients for sleep assessment, particularly following heart attacks or in cases of arrhythmia.
What the Research Shows
A study published in the Journal of Clinical Sleep Medicine in 2018 highlights just how common sleep apnoea is in people with severe heart conditions. Researchers in Singapore evaluated 101 patients who had experienced a major heart attack (ST-elevation myocardial infarction). Each patient underwent a sleep study during their hospital stay.
The findings were significant:
- 46 patients had clear obstructive sleep apnoea, with more than 15 breathing interruptions per hour.
- 12 patients had central sleep apnoea, typically associated with heart damage.
- Only 43 patients showed no signs of sleep-related breathing disorders.
When reassessed six months later, many patients’ sleep patterns had changed. Some who initially had OSA no longer did, while others developed new symptoms. Yet nearly 38% continued to have OSA.
The study reinforces an important point: sleep apnoea is common among heart attack patients, and its patterns can evolve. Ongoing monitoring is therefore crucial for accurate diagnosis and management.
Diagnosing Sleep Apnoea
A sleep study, or polysomnography, is the gold standard for diagnosing sleep disorders. It measures how you breathe, how much oxygen you get during sleep, and how your brain and heart respond throughout the night.
We offer a range of advanced diagnostic tests tailored to individual needs:
- Attended Level 1 Sleep Study (Polysomnography):
Conducted overnight in a sleep laboratory, this test records brain activity (EEG), eye movement, muscle tone, heart rhythm, airflow, oxygen levels, and breathing effort. It provides detailed insight into whether breathing interruptions are due to airway obstruction or neurological factors. - At-Home Sleep Test (Level 2 Study):
For suitable patients, a portable system allows sleep monitoring at home. It records breathing patterns, oxygen levels, and movement in a natural environment, offering convenience without compromising accuracy. - Split-Night Study
In some cases, the first half of the night is used to diagnose OSA, and the second half is used for CPAP titration — adjusting air pressure levels to prevent airway collapse. - Daytime Sleep Tests
- Multiple Sleep Latency Test (MSLT) measures how quickly you fall asleep in quiet situations during the day.
- Maintenance of Wakefulness Test (MWT) evaluates your ability to stay awake, often used to assess treatment effectiveness.
Treatment Options
If sleep apnoea is diagnosed, treatment is tailored to the individual’s condition, lifestyle, and heart health status.
Continuous Positive Airway Pressure (CPAP)
CPAP therapy uses a small machine to deliver gentle, pressurised air through a mask, keeping the airway open during sleep. During a CPAP titration study, the pressure settings are fine-tuned to achieve the most effective results. When used consistently, CPAP can reduce snoring, improve oxygen levels, and support cardiovascular stability.
Oral Appliance Therapy
For some people with mild to moderate OSA, custom-made oral appliances can reposition the jaw and tongue to maintain an open airway. These are fitted under specialist guidance.
Lifestyle and Supportive Measures
Lifestyle changes often work alongside medical treatments. These include:
- Achieving a healthy weight
- Reducing alcohol consumption, especially before bed
- Managing nasal congestion or allergies
- Maintaining a consistent sleep routine
The Benefits of Treating Sleep Apnoea
Managing sleep apnoea can have wide-reaching benefits. Many patients notice:
- More restful sleep and improved concentration
Reduced snoring and morning fatigue - Better mood and energy levels
- Stabilised blood pressure and improved cardiovascular function
While treatment outcomes vary, addressing OSA can help reduce the burden on the heart and support long-term recovery for those with cardiovascular disease.
When to Seek Help
If you or someone you know experiences:
- Loud, chronic snoring
- Pauses in breathing during sleep
- Morning headaches or dry mouth
- Daytime sleepiness or poor concentration
- Worsening fatigue following a heart event
It may be time to speak with your GP. They can assess your symptoms and refer you to a physician for a sleep and respiratory assessment.
Early testing and treatment can prevent further complications and restore healthier, more restorative sleep.
Better Sleep, Better Heart Health
A healthy night’s sleep is one of the simplest ways to protect your heart. Act early, follow your plan, and you’ll likely feel the benefits within weeks, clearer mornings, steadier energy, and greater long-term heart health.
Take the next step: contact us to arrange a qualified sleep study or telehealth consult (available Australia-wide) to assess snoring, daytime fatigue, and possible sleep apnoea.
This article provides general information only and does not replace professional medical advice. Always consult a qualified health professional for assessment and treatment tailored to your individual circumstances.
FAQs
1. What causes sleep apnoea?
Sleep apnoea happens when breathing repeatedly stops or becomes shallow during sleep. In obstructive sleep apnoea (OSA), the throat muscles relax and narrow the airway. In central sleep apnoea (CSA), the brain doesn’t send regular signals to the muscles that control breathing. Both types can reduce oxygen levels and disturb sleep.
2. How is snoring different from sleep apnoea?
Not all snoring means you have sleep apnoea. Occasional light snoring is common and usually harmless. However, if snoring is loud, frequent, and accompanied by gasping, choking, or daytime tiredness, it may be a sign of sleep apnoea and should be checked by a doctor or sleep specialist.
3. How can sleep apnoea affect heart health?
Untreated sleep apnoea can strain the heart. When breathing pauses during sleep, oxygen levels drop and the body releases stress hormones. This can increase blood pressure, affect heart rhythm, and raise the risk of heart disease or heart failure over time. Managing sleep apnoea helps support better cardiovascular health.
4. How is sleep apnoea diagnosed?
A sleep study (polysomnography) is used to diagnose sleep apnoea. It measures breathing patterns, oxygen levels, heart rate, and brain activity during sleep. Tests can be done in a sleep laboratory or, for suitable patients, at home with portable equipment. Your doctor can recommend the most appropriate option.
5. What are the treatment options for sleep apnoea?
Treatment depends on the type and severity of sleep apnoea. Common options include CPAP therapy, oral appliances, and lifestyle changes such as weight management, reduced alcohol intake, and maintaining good sleep habits. Your healthcare provider will tailor a plan to suit your needs and monitor your progress.
