Heart Palpitations at Night: Common Causes and When to See a Doctor

Heart Palpitations at Night: Causes and When to Worry

Waking up with your heart pounding, fluttering, or skipping beats can be frightening. Heart palpitations at night are common — but knowing which causes are benign and which require medical attention is important.

What Are Heart Palpitations?

Palpitations are the sensation of your heart beating unusually — too fast, too hard, too slow, or irregularly. They may feel like a flip-flop, pounding, or skipped beat in your chest, throat, or neck.

Common Benign Causes

1. Lying on Your Left Side

This position brings the heart closer to the chest wall, making normal heartbeats feel more prominent. Simply changing position often resolves the sensation.

2. Caffeine and Stimulants

Caffeine, alcohol, nicotine, and some decongestants can trigger palpitations. Effects may be delayed by several hours, explaining why palpitations occur at night after daytime consumption.

3. Stress and Anxiety

The sympathetic nervous system releases adrenaline during stress, increasing heart rate. Anxiety disorders are a leading cause of palpitations, especially at night when distractions are removed.

4. Dehydration

Low fluid volume reduces blood pressure, causing the heart to beat faster to compensate.

5. Low Blood Sugar

Hypoglycemia triggers adrenaline release, which can cause palpitations. More common in people with diabetes or those who skip meals.

6. Sleep Apnea

Oxygen drops during apnea episodes trigger the heart to work harder. Palpitations associated with snoring, gasping, or daytime sleepiness warrant a sleep study.

When Palpitations Are Serious

Seek immediate medical attention if palpitations are accompanied by:

• Chest pain or pressure
• Shortness of breath
• Dizziness or fainting
• Rapid heart rate over 150 bpm that doesn't resolve

See a doctor soon (within days) if:

• Palpitations are new and frequent
• You have a history of heart disease
• Palpitations last more than a few minutes
• You feel weak or unusually tired

Diagnosis

A doctor may order:

• ECG (electrocardiogram) — records heart rhythm
• Holter monitor — wearable ECG worn for 24-48 hours to capture intermittent arrhythmias
• Blood tests — check thyroid function, electrolytes, blood count
• Echocardiogram — ultrasound of the heart structure

Medical Disclaimer

This article is for informational purposes only. Heart palpitations with accompanying symptoms require prompt medical evaluation.