Avg Heart Rate (Sleep)

For a healthy adult the average sleeping heart rate is usually 50–70 bpm — about 10–20 beats below daytime resting. Trained people often see 40–50. What matters more than hitting a range is knowing your own usual level and spotting deviations.

The most common causes are evening alcohol, a late heavy meal, training shortly before bed, an oncoming illness, dehydration, stress, and a hot bedroom. Alcohol has the most visible effect: +5–15 bpm across the whole night.

A single high night is almost always explained by behaviour. See a doctor if your average sleeping HR stays above 90 bpm with no obvious cause, or if a high rate comes with shortness of breath, palpitations, night waking, and daytime sleepiness. This is not a diagnostic tool — a tracker is only a reason to raise the question.

Resting heart rate in trackers is usually the nightly minimum — the lowest point. Average sleeping HR averages the entire night including REM phases, when the heart speeds up. So the average always sits above the minimum, typically by 5–10 bpm.

Three things work: regular aerobic exercise (effect builds over weeks), skipping evening alcohol (effect the same night), and a cool bedroom at 18–19 °C. Also avoid heavy meals within 3 hours of bed.

Usually, yes. A nightly minimum of 45–50 bpm is typical for a healthy adult, and endurance-trained people often average 40–55 bpm asleep (see the table above). In 24-hour ECG recordings of healthy young adults, night-time bradycardia and even brief pauses between beats are a common finding. See a doctor if a low rate persists at rest during the day and comes with dizziness, fainting, shortness of breath, or marked weakness.

Heart rate is lowest in deep sleep, while REM sleep brings a surge of sympathetic activity — heart rate and blood pressure climb back to waking levels with short spikes. That is why the overnight graph looks like a saw, and it is normal. Spikes that come with snoring and pauses in breathing are different — a reason to get checked for sleep apnea.

In the second half of the cycle (the luteal phase) sleeping heart rate and temperature are reliably higher than during menses and ovulation — this shows up on the Oura ring too. Compare a night with the same phase of your previous cycle, not with yesterday.