Have you ever woken up with an increased heart rate?

Waking suddenly at 3 am with your heart hammering can feel as if you have sprinted up a staircase. Many people put it down to stress or a late coffee. When it happens often, especially alongside snoring, gasping or unrefreshing sleep, it may point to a sleep-related breathing problem.

In particular, obstructive sleep apnoea can trigger a racing heartbeat during sleep through repeated drops in oxygen and the body’s stress response.

Why Might You Wake Up with a Racing Heartbeat?

There are several reasons why your heart may race during the night, including:

• Stress and anxiety – adrenaline released during restless sleep can trigger palpitations.
• Nightmares or vivid dreams – sudden arousals may raise your heart rate.
• Caffeine, nicotine or alcohol – these can disrupt normal sleep patterns.
• Blood sugar changes – some people, particularly those with diabetes, may wake with a fast heartbeat.

These causes are usually temporary. If symptoms are frequent, it is important to consider other possibilities such as sleep apnoea.

What is Obstructive Sleep Apnoea (OSA)?

Obstructive sleep apnoea occurs when the muscles in the throat relax too much during sleep, causing the airway to narrow or collapse. This can reduce airflow, lower oxygen levels in the blood, and result in brief interruptions in breathing.

The body often reacts by briefly waking the person so that breathing can resume. These interruptions may happen many times each night, often without the sleeper being aware.

One of the possible obstructive sleep apnoea symptoms is waking up with an increased heart rate, which may be the body’s response to changes in oxygen levels.

Common Obstructive Sleep Apnoea Symptoms

OSA can affect people in different ways. Some possible symptoms include:

• Waking up with an increased heart rate
• Loud or persistent snoring
• Choking or gasping during sleep
• Daytime sleepiness or poor concentration
• Morning headaches
• Mood changes such as irritability or anxiety

The Link Between a Racing Heart and OSA

When breathing pauses occur during sleep, oxygen levels may fall. The body reacts by releasing stress hormones, which can increase heart rate and blood pressure.

Over time, repeated episodes may contribute to strain on the cardiovascular system. Research has shown an association between untreated sleep apnoea and health issues such as high blood pressure and abnormal heart rhythms.

Please note: Not everyone who wakes with a racing heart has sleep apnoea, but if it happens often, it’s a good idea to see a doctor.

How Sleep Apnoea is Diagnosed

The only way to confirm sleep apnoea is with a sleep study. In Australia, this may be arranged through a referral from your GP. You can download a referral form here (www.mansemedical.com.au/referrals/).

Types of sleep studies include:

• Level 1 in-lab sleep study – conducted overnight in a hospital or sleep clinic, monitored by trained staff.
• Level 2 at-home sleep study – performed at home using portable equipment that records breathing, oxygen levels, and heart rate.

These tests help determine whether OSA is present and, if so, its severity.

Treatment Options for Sleep Apnoea

Management depends on individual circumstances, the severity of the condition, and other health factors. Options may include:

CPAP Therapy for Sleep Apnoea

Continuous Positive Airway Pressure (CPAP) delivers gentle air pressure through a mask worn during sleep. This can help keep the airway open and reduce interruptions in breathing.

Oral Appliances

Custom dental splints can reposition the jaw or tongue to assist airflow. These may be suitable for some people with mild to moderate OSA.

Lifestyle Changes

For some, improving sleep routines, managing weight, reducing alcohol, or adjusting sleep position may help relieve symptoms.

Other Medical Options

In selected cases, surgical procedures or other treatments may be considered. These are assessed on a case-by-case basis.

Your doctor will discuss the most appropriate option for your circumstances.

When to Seek Help

If you regularly:

• Wake with a racing heart
• Experience loud snoring or pauses in breathing
• Feel excessively tired during the day

Waking up with an increased heart rate can have many causes. Sometimes it is harmless, but if it occurs often, it may be linked to a sleep condition such as obstructive sleep apnoea. Diagnosis and treatment vary from individual to individual, and consulting a physician is the best way to understand your own situation.

If you are concerned about your sleep or heart health, please speak with your GP. If appropriate, they may recommend a diagnostic sleep study.

For more information about our services, you can contact us directly. If you would like to discuss your symptoms further, you are welcome to book an appointment with our team.

Disclaimer

This information is general in nature and is not a substitute for professional medical advice. If you are concerned about your sleep or heart health, please consult your GP or a qualified health practitioner.

FAQs

1) Can obstructive sleep apnoea cause a racing heartbeat during sleep
Yes. Breathing interruptions can lower oxygen levels and trigger the body’s stress response, which in turn increases heart rate and blood pressure. Repeated events fragment sleep and may contribute to cardiovascular strain over time.

2) How do I know if I need a home test or an in-lab sleep study
Your GP or sleep specialist will advise based on symptoms, medical history and safety. Level-1 attended studies are the gold standard for comprehensive assessment. Level-2 home studies can suit many people with suspected moderate to severe OSA. 

3) What does CPAP therapy for sleep apnoea involve
A small device delivers a gentle flow of air through a mask while you sleep to help keep the airway open. Manse Medical supports the selection, fitting, and follow-up of masks to improve comfort and effectiveness. Side effects are usually manageable with adjustment. 

4) Are there alternatives if I cannot tolerate CPAP
Custom oral appliances may be beneficial for selected patients. Lifestyle and positional strategies can be helpful, particularly in milder cases of disease. Your clinician will discuss suitable options, expected benefits and risks, and whether a combined approach is best.

5) Does treating sleep apnoea lower heart risk
Sleep apnoea is associated with irregular heartbeat and other cardiovascular conditions, although shared risk factors also contribute. Treatment can improve symptoms and blood pressure in some people, but individual responses vary and long-term cardiovascular effects differ between patients.