Heart palpitations when lying down: what to know

Lying still removes daytime distractions, so normal heartbeat sensations can feel stronger. A large meal, caffeine, alcohol, stress, fever or dehydration can also be present at the end of the day. Some people notice a change in sensation with body position or after turning onto one side. Breathlessness when lying flat, waking short of breath, leg swelling or unusual tiredness needs attention because these symptoms can occur with heart failure. Anaemia, thyroid disease and atrial fibrillation are other conditions a clinician may consider.

Sit up or change position, breathe slowly and give yourself time to settle. Keep the bedroom cool, avoid late stimulants and limit alcohol. Note whether the beat is steady or uneven, when it began, how long it lasted and whether it followed food, stress or exercise. Arrange a medical review for repeated episodes, particularly if sleep is disrupted or you have breathlessness. An ECG or longer rhythm recording may help capture an intermittent pattern.

Call emergency services for chest pressure, severe breathlessness, fainting, sudden collapse or palpitations with severe dizziness. Seek prompt advice for new irregular episodes, breathlessness when lying flat, waking gasping or rapidly worsening swelling. Rest and avoid driving if you feel unsteady.

Ask whether position, medicines or an underlying rhythm issue could explain the sensation, and whether you need an ECG, blood tests or home monitoring. Mention sleep disruption and any breathing or swelling symptoms.