I wake up and my heart starts racing: A cardiologist explains why

Waking up suddenly with a racing heart can be alarming, especially if it occurs unexpectedly and only lasts a few seconds. Dr Aseem Dhall, Director & HOD at ISIC Multispeciality Hospital, explains that this could be due to the abrupt transition from sleep to wakefulness, which triggers the release of stress hormones like adrenaline.

This "fight-or-flight" response can temporarily increase heart rate. Other potential causes include vivid dreams or nightmares, anxiety, emotional stress, dehydration, caffeine, poor sleep, and sleep disturbances. In most cases, the heart returns to its normal rhythm within seconds and is not a sign of a serious problem. However, if a racing heartbeat persists, occurs frequently, lasts several minutes, or happens without a clear trigger, it could indicate a heart rhythm disorder, such as atrial fibrillation or supraventricular tachycardia.

If you experience recurring episodes or any additional symptoms like chest pain, shortness of breath, dizziness, or fainting, it's essential to consult a cardiologist. Tests like an ECG, Holter monitor, blood tests, echocardiogram, or sleep study may be recommended to determine the underlying cause.