9 minute read

Medically reviewed by Dr Ravi Assomull, Consultant Cardiologist – July 2026

Heart Palpitations at Night: When It's Anxiety and When It's Your Heart

Introduction

Waking in the night with a racing, fluttering, or pounding sensation in your chest can be unsettling. Many people experience heart palpitations at night and immediately worry that something is seriously wrong with their heart. Others assume it is simply stress or anxiety and do nothing further. In reality, the truth often lies somewhere between those two responses.

Nocturnal palpitations — palpitations that occur during sleep or when lying down — are a common reason people search online for reassurance, and they are one of the more frequent concerns raised during cardiology consultations. They can feel alarming precisely because they happen when the body is at rest and the mind is quiet, making any unusual sensation more noticeable.

This article aims to explain what heart palpitations at night are, why they occur, how anxiety and genuine cardiac causes differ, and what investigations may help clarify the underlying cause. Understanding these differences can help you make informed decisions about when to seek medical advice.

What Are Heart Palpitations at Night?

What causes heart palpitations at night, and how do you know if they are related to anxiety or your heart?

Heart palpitations at night are an awareness of an irregular, rapid, or forceful heartbeat during sleep or when resting in bed. They may feel like a flutter, thud, or skipped beat. Both anxiety and underlying cardiac conditions can cause nocturnal palpitations. Because symptoms alone cannot reliably distinguish the two causes, a clinical assessment and appropriate investigations are often recommended to determine the underlying reason.

Palpitations are the subjective sensation of your heartbeat becoming more noticeable than usual. They may be perceived as:

• A racing or pounding heartbeat
• A fluttering or trembling sensation in the chest
• A feeling that the heart has "skipped" a beat
• An irregular rhythm

They can last seconds or several minutes and may occur in isolation or repeatedly throughout the night. Importantly, palpitations are a symptom — not a diagnosis — and they can arise from a wide range of causes, both cardiac and non-cardiac.

How the Heart's Electrical System Works

To understand why palpitations occur, it helps to know a little about how the heart generates and maintains its rhythm. The heart beats in response to electrical signals that originate in a cluster of cells called the sinoatrial (SA) node, located in the upper right chamber. This natural pacemaker sends a signal that causes the heart's upper chambers (atria) to contract, followed by the lower chambers (ventricles).

When this electrical system functions normally, the heart beats in a steady, coordinated rhythm — typically between 60 and 100 beats per minute at rest. When the electrical signals are disrupted — whether by stress hormones, structural changes, or abnormal electrical pathways — the rhythm can become irregular, too fast, or too slow. These disruptions are known as arrhythmias, and they are one reason palpitations can occur, even during sleep.

When Anxiety Is the Likely Cause

Anxiety, stress, and panic disorders are among the most common non-cardiac causes of heart palpitations at night. When the body's stress response is activated, adrenaline and other hormones are released into the bloodstream, raising the heart rate and increasing the force of contractions. Even low-level background anxiety — the type that may not be consciously felt during the busy daytime — can manifest more prominently at night when external distractions are absent.

Signs that anxiety may be contributing include:

• Palpitations accompanied by a sense of dread, worry, or panic
• Rapid breathing or difficulty catching your breath
• Sweating, trembling, or feeling of unreality
• Symptoms that resolve once you feel calmer or distract yourself
• A known history of anxiety or panic disorder
• Palpitations linked to stressful life events

Caffeine, alcohol, certain medications, and sleep deprivation can also trigger palpitations that mimic anxiety-related episodes, particularly in the evening and overnight hours.

However, it is important to note that anxiety and a cardiac arrhythmia can coexist. Anxiety does not rule out a cardiac cause, and symptoms should not be dismissed without appropriate assessment.

When Palpitations May Indicate a Heart Condition

While many nocturnal palpitations are benign, some may be associated with underlying cardiac conditions that benefit from medical evaluation. Conditions that can cause palpitations at night include:

• Atrial fibrillation (AF) — an irregular and often rapid heart rhythm affecting the upper chambers of the heart
• Supraventricular tachycardia (SVT) — episodes of very rapid heart rate originating above the ventricles
• Ventricular ectopic beats — extra heartbeats arising from the lower chambers, often felt as a "thud" or "missed beat"
• Heart block or bradyarrhythmias — abnormally slow rhythms that can cause palpitations or pauses
• Structural heart conditions — such as valve disorders or cardiomyopathy

Features that may suggest a cardiac cause requiring assessment include:

• Palpitations accompanied by chest pain or tightness
• Dizziness, lightheadedness, or near-fainting during an episode
• Breathlessness during palpitations
• Palpitations that are frequent, prolonged, or worsening
• A personal or family history of heart conditions or arrhythmias
• Palpitations in an older adult or someone with known cardiovascular risk factors

If you experience severe chest pain, fainting, collapse, or breathlessness alongside palpitations, you should seek urgent medical attention immediately by calling 999 or attending your nearest A&E.

Cardiology Tests That May Help Identify the Cause

A cardiology assessment for nocturnal palpitations typically involves a combination of clinical history, examination, and targeted investigations. The appropriate tests will depend on individual circumstances and clinical judgement.

ECG (Electrocardiogram)

A resting ECG records the heart's electrical activity over a short period. It can detect arrhythmias, conduction abnormalities, and signs of structural changes. However, a standard resting ECG may be normal between episodes, which is why extended monitoring is often valuable.

Ambulatory ECG / Holter Monitoring

Because palpitations often occur unpredictably — particularly at night — a Holter monitor or ambulatory ECG is frequently recommended. This wearable device continuously records the heart's rhythm over 24 hours, 48 hours, or longer, capturing any arrhythmias that occur during daily activities and sleep. If symptoms are infrequent, longer-term monitoring devices may be used.

Echocardiogram

An echocardiogram uses ultrasound to assess the heart's structure and function, including the valves and chambers. It helps identify any underlying structural issues that may contribute to arrhythmias.

Blood Tests

Blood tests may be performed to check thyroid function (an overactive thyroid can cause palpitations), electrolyte levels, blood count, and other relevant markers.

When to Seek a Private Cardiology Assessment

You may wish to consider a private cardiology consultation if:

• Palpitations are frequent, prolonged, or recurrent
• Episodes are accompanied by dizziness, chest discomfort, or breathlessness
• Symptoms are unexplained and causing concern
• You have a personal or family history of arrhythmias or heart disease
• You would like prompt specialist assessment and investigation

A cardiologist can review your history thoroughly, arrange appropriate investigations, and explain the findings in the context of your overall health.

Lifestyle Factors and Heart Health Advice

Certain lifestyle modifications may help reduce the frequency of palpitations, particularly those triggered by lifestyle factors rather than structural cardiac causes:

• Reduce caffeine and alcohol, especially in the evening
• Manage stress through techniques such as mindfulness, breathing exercises, or cognitive behavioural therapy (CBT)
• Maintain regular sleep patterns and prioritise sleep hygiene
• Stay well hydrated, as dehydration can contribute to palpitations
• Avoid smoking, which can affect heart rhythm
• Eat regular, balanced meals to maintain stable blood sugar

Lifestyle changes may support cardiovascular wellbeing but do not replace medical assessment. Cardiovascular risk varies between individuals depending on age, family history, existing conditions, and lifestyle factors.

Key Points to Remember

• Heart palpitations at night are a common symptom with a wide range of possible causes, including anxiety and cardiac arrhythmias
• Anxiety, stress, caffeine, and alcohol can all trigger nocturnal palpitations
• Some palpitations may be associated with conditions such as atrial fibrillation or other arrhythmias that benefit from medical evaluation
• An ECG, Holter monitor, or echocardiogram may be recommended depending on your individual circumstances
• Symptoms such as chest pain, fainting, or breathlessness during palpitations require urgent medical attention
• A cardiology assessment can help determine whether palpitations are benign or require further investigation or treatment

Frequently Asked Questions

Are heart palpitations at night dangerous?

Most nocturnal palpitations are not dangerous and may be related to anxiety, lifestyle factors, or benign ectopic beats. However, some palpitations can be associated with cardiac arrhythmias that benefit from medical assessment. If your palpitations are frequent, accompanied by chest discomfort, dizziness, or breathlessness, or if you have a known heart condition, it is advisable to seek a medical evaluation rather than assuming the cause is benign.

Can anxiety cause heart palpitations while sleeping?

Yes. Anxiety and heightened stress responses can cause palpitations even during sleep. The body's adrenaline response can elevate heart rate and increase awareness of heartbeats. Some people experience nocturnal panic episodes without being consciously aware of anxiety during waking hours. However, anxiety-related palpitations and cardiac arrhythmias can coexist, and professional assessment may be needed to evaluate both possibilities.

How is the cause of nocturnal palpitations diagnosed?

Diagnosis typically involves a clinical history and physical examination, followed by investigations such as a resting ECG, ambulatory Holter monitoring, and sometimes an echocardiogram or blood tests. Because palpitations often occur unpredictently, extended heart rhythm monitoring during daily life and sleep can be particularly informative. The appropriate investigations will depend on individual circumstances and a clinician's assessment.

What is atrial fibrillation and can it cause night-time palpitations?

Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia. It occurs when the electrical signals in the heart's upper chambers become chaotic, causing an irregular and often rapid heartbeat. AF can occur at any time, including during sleep, and may be perceived as a fluttering, irregular, or racing heartbeat. Not everyone with AF experiences noticeable symptoms. If AF is suspected, prompt medical assessment is important, as it can be associated with an increased risk of stroke.

When should I go to A&E rather than booking a cardiology appointment?

You should seek emergency medical attention immediately if palpitations are accompanied by severe chest pain, collapse, loss of consciousness, extreme breathlessness, or symptoms suggesting a heart attack or stroke. In these situations, do not wait for a routine appointment — call 999 or attend your nearest A&E without delay. Routine private cardiology assessment is appropriate for persistent, recurrent, or unexplained palpitations that are not associated with emergency symptoms.

Can lifestyle changes stop heart palpitations at night?

Lifestyle adjustments — such as reducing caffeine and alcohol, managing stress, improving sleep hygiene, and staying hydrated — can reduce palpitation frequency in some individuals, particularly when lifestyle factors are contributing. However, lifestyle changes alone may not be sufficient if an underlying cardiac arrhythmia is present. A medical assessment helps clarify the cause so that the most appropriate approach can be considered for your individual circumstances.

Conclusion

Heart palpitations at night are a symptom experienced by many people, and they understandably cause concern. As this article has explained, the causes range from anxiety and lifestyle triggers to cardiac arrhythmias that may benefit from investigation and management. The challenge is that symptoms alone cannot reliably distinguish between a benign cause and one that requires medical attention.

If you are experiencing heart palpitations at night — particularly if they are recurrent, accompanied by other symptoms, or causing significant anxiety — a cardiology assessment can provide clarity and peace of mind. Investigations such as ambulatory ECG monitoring can capture rhythm abnormalities that a standard resting ECG may miss.

Cardiovascular symptoms, test results, and treatment options should always be assessed individually based on a person's clinical history, symptoms, and appropriate medical examination.

If you experience severe chest pain, fainting, or breathlessness alongside palpitations, please seek urgent medical attention immediately.

Disclaimer: This article is intended for general educational purposes only and does not constitute personalised medical advice, diagnosis, or treatment. Cardiovascular symptoms and conditions can vary between individuals. If you have concerns about your heart health or symptoms, seek appropriate advice from a qualified healthcare professional. If you experience symptoms that may indicate a medical emergency, seek urgent medical attention.

Next Review Due: 24 July 2027