Why Do We Sometimes Wake Up With A Racing Heart?

By Vanshika Gaur
16 Jun 2025, 18:00 IST

Waking up with a racing heart can feel alarming, but it may be linked to various factors, such as physical, emotional, or hormonal. Tap to know the reasons why you may be waking up with a racing heart.

Anxiety

Stressful thoughts, nightmares, or anxiety attacks during sleep can lead to a sudden increase in heart rate, causing you to wake up with a racing heart.

Hormonal Fluctuations

Hormonal fluctuations, particularly adrenaline and cortisol, can cause the heart to race, especially during early morning hours.

Low Blood Sugar Levels

A sudden drop in blood sugar during the night can stimulate adrenaline, causing palpitations or a racing heartbeat.

Sleep Apnoea

Obstructive sleep apnoea disrupts breathing patterns, making the heart work harder and potentially leading to racing heart upon waking.

Dehydration

Lack of fluids affects blood pressure regulation and may increase heart rate as the body tries to maintain circulation.

Stimulants

Caffeine, alcohol, or certain medications taken before bed may interfere with heart rhythm and cause sudden palpitations.

Overactive Thyroid

Hyperthyroidism can also elevate heart rate during both day and night, leading to sudden episodes of racing heartbeat.

Information Credits

According to PubMed, low blood sugar levels, anxiety, hormonal fluctuations, and more can lead to a racing heart. It is advisable to consult a healthcare professional for personalised suggestions.