Atrial Fibrillation

Atrial fibrillation (AF) is a common heart rhythm condition that can increase the risk of stroke, heart failure, and other cardiovascular problems. Symptoms can vary considerably, and some people may have AF without noticing it.

Sleep and AF are connected in several ways. Sleep apnea has the strongest established link with AF, while short sleep, insomnia, and fragmented sleep have also been associated with the condition.

This page explains how sleep may affect AF, what may contribute to this connection, and when to seek support.

Atrial fibrillation (AF) occurs when abnormal electrical activity disrupts the coordinated rhythm of the heart’s two upper chambers, the atria. This causes blood to move less efficiently through the atria, which can allow clots to form and increase the risk of stroke. Over time, the irregular rhythm can also make the heart work less efficiently and contribute to heart failure and other cardiovascular problems.

AF can be intermittent or persistent. Some people experience palpitations, shortness of breath, fatigue, or reduced exercise tolerance, while others have few or no noticeable symptoms. Diagnosis usually requires an electrocardiogram or other heart-rhythm monitoring. Treatment commonly includes medication to reduce stroke risk and control the heart rate or rhythm, although some people may also need procedures such as cardioversion or catheter ablation.

Many factors influence the risk of AF, including age, genetics, cardiovascular health, body weight, alcohol use, and sleep. During healthy sleep, sympathetic nervous-system activity typically decreases and heart rate slows. Disrupted sleep can interfere with this normal pattern and increase nervous-system activity.

Short sleep and insomnia have both been associated with a higher risk of AF. Fragmented sleep, including frequent awakenings or spending longer periods awake during the night after initially falling asleep, has also been linked with AF in recent studies. These sleep changes may affect autonomic control of the heart and influence inflammation and other processes that affect the atria.

Some of these associations have also been observed in people without obstructive sleep apnea, suggesting that the relationship between sleep and AF is not explained by sleep apnea alone.

Obstructive sleep apnea nevertheless has one of the strongest established links with AF. Repeated pauses in breathing can lower blood oxygen levels, trigger brief awakenings, and activate the nervous system. Over time, these stresses may contribute to electrical and structural changes in the atria that make AF more likely.

Poor sleep alone does not mean someone will develop AF. Many factors contribute to AF, and sleep is one part of that broader picture.

AF can affect people differently. Some people have occasional episodes, while others experience AF more frequently or continuously. Symptoms may also vary depending on when episodes occur and how fast the heart is beating.

Nighttime episodes can disturb sleep

Some people notice palpitations or an irregular heartbeat while in bed, while others may wake during an AF episode. Shortness of breath or concern about an episode can also make it harder to fall asleep or return to sleep. A nighttime episode does not necessarily mean that sleep caused the AF.

Daytime fatigue and low energy

Fatigue and reduced exercise tolerance are common in people with AF, but poor sleep can cause similar symptoms. Sleep apnea, insomnia, medications, or another health condition may also contribute, so persistent fatigue may need further assessment.

Physical activity may feel more difficult

A fast or irregular heart rate can make exercise or everyday activity feel harder. Breathlessness, fatigue, or reduced exercise tolerance may be more noticeable during an episode, although symptoms vary considerably between individuals.

Medication and daily routines

Many people with AF take medication to reduce stroke risk, control heart rate, or help maintain a normal rhythm. Medication timing and side effects can affect how someone feels during the day or night, so new fatigue, dizziness, sleep disturbance, or other symptoms should be discussed with the care team.

AF may cause few or no symptoms

Some people have AF without noticeable palpitations or other symptoms. Because AF can be symptom-free, how a person feels or sleeps does not reliably show whether the condition is present or well controlled. Heart-rhythm monitoring may therefore still be needed, even when a person feels normal.

Heart rhythm, sleep, activity, and medication effects can change across the full 24-hour day. Looking at when AF symptoms or episodes occur may help identify patterns across the day and night. A sleep and AF diary can help the care team track these changes, identify patterns, and consider whether a sleep disorder may be contributing to symptoms or AF episodes.

Healthy sleep can support cardiovascular health, but it should be considered alongside established AF treatment.

Support a consistent day-night pattern

Try to keep bedtime and wake time reasonably consistent. Regular light exposure, physical activity, and predictable daily routines can help support healthy circadian rhythms.

Allow enough time for sleep

Most adults need about seven to nine hours of sleep each night. Persistent short sleep or a major change in usual sleep duration is worth discussing with a healthcare professional.

Address persistent insomnia

Ongoing difficulty falling asleep or staying asleep should be assessed rather than assumed to be part of AF. Insomnia has been associated with AF, although treating insomnia has not been shown to prevent AF.

Watch for signs of sleep apnea

Sleep apnea is common in people with AF. Loud snoring, witnessed breathing pauses, choking or gasping during sleep, or excessive daytime sleepiness may suggest sleep apnea and should prompt further assessment. Learn more. 

Continue AF treatment as prescribed

Take AF medications as prescribed and discuss any concerns about side effects or timing with the care team. Do not change the dose or timing of medication based on sleep symptoms or home-monitoring results without medical advice.

Support cardiovascular health during the day

Regular physical activity, maintaining a healthy weight, controlling blood pressure, and limiting alcohol can support cardiovascular health and may also help improve sleep.

Keep a sleep and symptom record

A simple record of sleep times, nighttime waking, AF symptoms or known episodes, medication timing, and daytime symptoms can help identify patterns across the 24-hour day.

Not every sleep problem in someone with AF is caused by the arrhythmia. Other possible contributors include insomnia, sleep apnea, restless legs syndrome, pain, stress, anxiety, depression, menopause, alcohol, nighttime urination, medication effects, and changes in daily routines. More than one factor can affect sleep at the same time. Identifying the underlying cause can help guide the most appropriate support or treatment.