A pounding, fluttering or skipped heartbeat can seem especially noticeable when the room becomes quiet and you are trying to sleep. Most nighttime palpitations are not dangerous, but recurring episodes or warning symptoms deserve proper medical evaluation.
Heart palpitations often seem more noticeable at night because you are quiet, resting and less distracted by daytime activity. Stress, lack of sleep, caffeine, nicotine, alcohol, some medicines, dehydration, thyroid disease, anemia and genuine heart rhythm disorders can also contribute. Sleeping position may alter how strongly you perceive your heartbeat in some cases, but lying on your left side does not generally mean that you are dangerously pressing on your heart or vagus nerve. Recurrent or prolonged nighttime palpitations should be discussed with a healthcare professional.
Why Do Heart Palpitations Feel More Noticeable at Night?
Heart palpitations are sensations that make you unusually aware of your heartbeat. You may feel racing, pounding, fluttering, a skipped beat, an extra beat or a brief pause followed by a stronger thump.
Palpitations are a symptom or sensation, not a diagnosis. Sometimes the heart rhythm is completely normal when the sensation occurs. At other times the sensation may correspond to a premature beat or another arrhythmia.
At night, there is much less competing sensory information. You are usually lying quietly, moving less and paying more attention to internal sensations. A heartbeat that went unnoticed during a busy afternoon may therefore seem surprisingly strong when you are lying in a silent bedroom.
This is one reason nighttime awareness is common. However, it should not be assumed that every nighttime palpitation is merely increased awareness.
Our broader guide to heart palpitation symptoms explains how patients commonly describe racing, fluttering, pounding and skipped beats.
Common Causes and Triggers of Palpitations at Night
1. Increased awareness at rest
The heartbeat may simply become easier to feel when you are lying quietly. This does not necessarily mean your heart suddenly started beating abnormally when you went to bed.
2. Premature beats
Premature atrial contractions (PACs) and premature ventricular contractions (PVCs) can feel like a skipped beat, pause, flutter or sudden thump. Occasional premature beats occur in many people, but frequent or worsening symptoms sometimes require rhythm monitoring.
3. Stress and anxiety
Stress, anxiety and panic can increase heart rate and make heartbeat sensations more noticeable. Worry can also become more prominent when you are trying to fall asleep without daytime distractions.
Learn more about anxiety and heart palpitations.
4. Caffeine and nicotine
Caffeine and nicotine can trigger or intensify palpitations in susceptible people. The effect depends on the individual, the dose and the timing.
See our detailed guide to caffeine and heart palpitations.
5. Alcohol
Alcohol can contribute to palpitations in some people and is a recognized trigger for atrial fibrillation in susceptible individuals. Symptoms may therefore appear later in the evening or overnight after drinking.
6. Large or late meals
Some people notice palpitations after eating, particularly after a large meal or when alcohol or caffeine is consumed with it. However, there is no universal rule requiring everyone with palpitations to stop eating four hours before bed.
Read more about heart palpitations after eating.
7. Medicines and stimulants
Some medicines can increase heart rate or provoke palpitations. Examples include certain nasal decongestants containing pseudoephedrine, some asthma medicines and other stimulant medications.
Do not stop a prescribed medicine without speaking with the clinician who prescribed it.
8. Dehydration or illness
Dehydration, fever and significant electrolyte disturbances can increase heart rate or contribute to premature beats. The underlying problem, rather than the time of night itself, is responsible.
9. Thyroid disease or anemia
Hyperthyroidism can cause a rapid, forceful or irregular heartbeat. Iron-deficiency anemia and other forms of significant anemia can also produce a faster heartbeat and palpitations.
See our guide to thyroid problems and heart palpitations.
10. A heart rhythm disorder
Atrial fibrillation, supraventricular tachycardia and other arrhythmias can occur at night as well as during the day. Recurrent episodes that begin suddenly, last for a significant period or feel markedly irregular deserve medical assessment.
Many other factors can contribute. For a broader overview, see causes and triggers of heart palpitations.
Does Sleeping Position Cause Heart Palpitations?
Some people report noticing palpitations more when lying on one side, particularly the left. One straightforward explanation is that changes in body position may alter how prominently the heartbeat is felt against the chest wall.
Research also suggests that body position may influence arrhythmia symptoms in a subset of people who already have certain rhythm disorders. In one small study of patients with symptomatic paroxysmal atrial fibrillation, about one in five reported a specific body position as a trigger, with the left-side and supine positions reported most often.
This finding should not be generalized to everyone with nighttime palpitations. It does not mean that left-side sleeping routinely causes atrial fibrillation, nor does it mean that people should universally avoid sleeping on their left side.
Important Correction: The Vagus Nerve Is Not Being “Pressed”
Older descriptions sometimes state that sleeping on the left side or back places external pressure on the vagus nerve, causing an abnormal electrical impulse and therefore a palpitation.
This is not an appropriate explanation for ordinary nighttime palpitations. Body position may change heartbeat perception and may influence rhythm in selected patients, but there is no reason to tell most readers that their sleeping position is physically compressing the vagus nerve and disrupting the heartbeat.
For a more detailed discussion specifically about body position, see heart palpitations when lying down.
What About Sleep Apnea?
Sleep apnea deserves consideration when nighttime palpitations occur together with symptoms such as loud snoring, repeated choking or gasping during sleep, witnessed pauses in breathing, frequent nighttime awakenings or excessive daytime sleepiness.
Obstructive sleep apnea is associated with cardiovascular disease and with arrhythmias, particularly atrial fibrillation. This does not mean that every nighttime palpitation is caused by sleep apnea, but symptoms suggesting a sleep disorder are worth discussing with your healthcare professional.
Treating diagnosed sleep-disordered breathing is an important part of overall cardiovascular care.
How Are Nighttime Palpitations Evaluated?
If the episodes recur, last longer or cause concern, your clinician will usually try to determine whether the sensation represents a normal rhythm, premature beats or another arrhythmia.
Your doctor may ask:
- what the heartbeat feels like;
- whether it feels regular or irregular;
- whether the episode starts and stops suddenly or gradually;
- how long it lasts;
- whether it happens only when lying down;
- whether it wakes you from sleep;
- whether changing position affects it;
- whether caffeine, alcohol, nicotine or medicines are involved;
- whether you snore or have possible sleep apnea symptoms;
- whether dizziness, fainting, chest pain or shortness of breath occurs;
- whether you have known heart disease; and
- whether there is relevant family history of heart disease or sudden death.
12-lead ECG
An electrocardiogram (ECG) can identify many rhythm and conduction abnormalities. However, a short ECG performed while you are symptom-free may be completely normal even when an intermittent arrhythmia is responsible.
Holter, patch or event monitor
If the palpitations occur intermittently, ambulatory ECG monitoring can record the heart over a much longer period.
Frequent nightly symptoms may be suitable for a Holter or continuous patch monitor, while less frequent symptoms may require longer event monitoring. The goal is to establish a symptom-rhythm correlation — determining exactly what the heart rhythm was when the sensation occurred.
Blood tests
Depending on your symptoms and medical history, your clinician may consider blood tests for anemia, thyroid dysfunction, significant electrolyte abnormalities or other medical conditions.
Additional cardiac or sleep testing
Echocardiography or other cardiac testing may be appropriate when there are abnormal examination findings, an abnormal ECG, documented arrhythmia or concern about structural heart disease.
If the history suggests obstructive sleep apnea, a sleep evaluation or sleep study may also be considered.
What Can You Do About Heart Palpitations at Night?
When symptoms are mild and there are no emergency warning signs, several practical steps may help you identify patterns and reduce avoidable triggers.
1. Keep a symptom record
Record when the episode occurred, how long it lasted, what the heartbeat felt like and what you had eaten or drunk during the preceding hours. Also note medicines, exercise, stress and sleeping position.
2. Reduce triggers that clearly affect you
If caffeine, nicotine, alcohol or a particular stimulant repeatedly precedes the symptoms, reducing that exposure may help.
3. Stay appropriately hydrated
Adequate fluid intake is reasonable for most people, particularly after exercise, heat exposure, vomiting or diarrhea. People who have been told to restrict fluids because of heart, kidney or other medical conditions should follow their clinician’s individualized advice.
4. Manage stress and protect sleep
Slow breathing, relaxation exercises, meditation or a quiet bedtime routine can help when anxiety makes the heartbeat more noticeable. These techniques can reduce distress but should not be presented as treatments that reliably terminate an arrhythmia.
5. Change position if that makes you more comfortable
If you notice your heartbeat strongly in one position, sitting up or rolling into another comfortable position may make the sensation less noticeable.
There is no general medical recommendation that everyone with nighttime palpitations should avoid the left side.
If you suspect a medicine is contributing to your palpitations, check the medication information and discuss it with your prescribing clinician or pharmacist. The safest response is usually medication review rather than abruptly stopping necessary treatment.
Dr. Albana’s Note
When a patient tells me that their heartbeat becomes very noticeable as soon as they lie quietly in bed, I first ask whether the heart is actually racing or whether each beat simply feels stronger. I also ask whether the episode begins suddenly, whether the rhythm feels regular, whether changing position changes the sensation, and whether the person wakes from sleep with it. Nighttime symptoms are often reassuring, but recurrent palpitations are easier to assess when we document what the heart rhythm is actually doing during an episode.
When Should You See a Doctor?
Arrange medical assessment if nighttime palpitations:
- keep returning or are becoming more frequent;
- last longer than a few minutes repeatedly;
- wake you frequently from sleep;
- are persistently fast or markedly irregular;
- occur with recurring dizziness or unusual weakness;
- occur if you already have heart disease;
- started after a new medicine or dose change;
- occur with symptoms suggesting thyroid disease or significant anemia;
- occur together with loud snoring, choking or possible sleep apnea; or
- occur in someone with an important family history of heart disease or unexplained sudden death.
Frequent or prolonged symptoms are discussed further in our constant heart palpitations guide.
Urgent Warning Signs
Seek urgent or emergency medical assessment if palpitations occur with:
- chest pain, significant pressure or tightness;
- fainting or loss of consciousness;
- collapse;
- severe dizziness or near-fainting;
- severe shortness of breath;
- a sustained very rapid heartbeat together with feeling seriously unwell;
- new severe weakness; or
- rapidly worsening symptoms.
Do not stay in bed trying different positions or relaxation techniques if you have significant chest pain, fainting, severe breathlessness or other emergency symptoms.
For additional education about this combination of symptoms, see chest pain and heart palpitations, but obtain urgent medical care first when emergency warning signs are present.
Most Asked Questions
Why do I only notice heart palpitations at night?
Your heartbeat may be easier to notice because you are lying quietly with fewer distractions. However, nighttime triggers such as alcohol, caffeine, nicotine, stress, medicines or an arrhythmia can also contribute. Recurrent episodes should not automatically be attributed only to increased awareness.
Are heart palpitations at night dangerous?
Many brief nighttime palpitations are not dangerous, particularly when they are infrequent and no other symptoms are present. However, recurrent, prolonged or worsening episodes deserve assessment, especially when accompanied by dizziness, fainting, chest pain or shortness of breath.
Why does my heartbeat feel stronger when I lie on my left side?
Body position can change how prominently you perceive your heartbeat, and some people report position-related symptoms. Small studies suggest that body position may also influence arrhythmia symptoms in a subset of people with established atrial fibrillation. This does not mean left-side sleeping is generally dangerous or that it routinely causes arrhythmias.
Should I avoid sleeping on my left side?
There is no blanket recommendation that people with palpitations should avoid sleeping on the left side. If one position reliably triggers symptoms, mention that pattern to your healthcare professional because it may help guide rhythm monitoring.
Can sleep apnea cause nighttime heart rhythm problems?
Obstructive sleep apnea is associated with cardiac arrhythmias, particularly atrial fibrillation. If you have loud snoring, witnessed pauses in breathing, choking or gasping during sleep, or significant daytime sleepiness, discuss these symptoms with your healthcare professional.
Can caffeine cause palpitations at bedtime?
Caffeine can make palpitations more noticeable in susceptible people, although sensitivity varies greatly. If symptoms repeatedly follow coffee, energy drinks or another caffeine source later in the day, reducing the amount or taking it earlier may help identify whether it is an individual trigger.
Can a normal ECG rule out nighttime arrhythmias?
No. A resting ECG records only a short period. If an arrhythmia happens intermittently at night, a Holter monitor, patch monitor or event recorder may sometimes be needed to capture the rhythm during symptoms.
Should I turn on the television to distract myself from palpitations?
Distraction may make a benign heartbeat sensation less noticeable, but it does not determine whether the heart rhythm is normal and does not treat an arrhythmia. Recurrent symptoms are better addressed by identifying triggers and documenting the rhythm when appropriate.
Related Heart Palpitation Guides
Medical References
- American Heart Association. How Serious Are Heart Palpitations? Causes, Symptoms and When to Worry. 2026. American Heart Association .
- American Heart Association. Symptoms, Diagnosis and Monitoring of Arrhythmia. American Heart Association .
- NHS. Heart Palpitations. Updated 2026. NHS .
- Mayo Clinic. Heart Palpitations: Symptoms and Causes. Mayo Clinic .
- Cleveland Clinic. Heart Palpitations at Night: Symptoms, Causes and Treatment. Cleveland Clinic .
- Gottlieb LA, Blanco LS, Hocini M, Dekker LRC, Coronel R. Self-Reported Onset of Paroxysmal Atrial Fibrillation Is Related to Sleeping Body Position. Front Physiol. 2021;12:708650. PubMed .
- American Heart Association. Sleep Disorders and Atrial Fibrillation. American Heart Association .
- National Heart, Lung, and Blood Institute. Sleep Apnea: Living With. NHLBI .
About the Medical Team
Dr. Albana Greca, MBBS, MMedSc
Family Physician / General Practitioner
Dr. Albana Greca has more than 20 years of experience in primary care, general medicine, chronic disease management, prevention, patient education and digital health.
Dr. Benard Shehu, MBBS, MS
Cardiologist
Dr. Benard Shehu has more than 19 years of cardiovascular experience, including clinical experience relevant to arrhythmias and cardiovascular disease.