Sleeping Heart Rate by Age: What’s Normal?
Learn what your sleeping heart rate should be by age. Understand normal ranges, how it changes during sleep, and what resting and exercise heart rates mean.
Your heart doesn’t rest when you sleep—but it does slow down. Monitoring your sleeping heart rate by age is one of the most effective ways to track heart and overall health.
Whether you’re curious about your own heart rate at night or wondering what should my resting heart rate be, this guide breaks down everything you need to know—by age group and health context.
Key Takeaways
- A normal sleeping heart rate by age ranges from 40 to 70 bpm in adults and is higher in children.
- Your resting heart rate is a strong indicator of heart health—aim for 60–100 bpm when awake.
- During exercise, target 64–93% of your max heart rate depending on intensity.
- A 103 pulse rate might be normal or a sign of stress—context is key.
- Wearables and lifestyle changes can help track and optimize your heart rate patterns.
Understanding Heart Rate
Resting vs. Sleeping vs. Exercising
Before diving into sleeping heart rate by age, it’s important to distinguish between different types of heart rates:
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Resting Heart Rate (RHR): Measured when you’re awake and calm—typically after waking up or while sitting quietly.
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Sleeping Heart Rate: Naturally slower than resting heart rate, as your body conserves energy and repairs itself during sleep.
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Exercise Heart Rate: Increases based on workout intensity. Monitoring this helps measure cardiovascular fitness and exercise safety.
Did You Know? The average pulse rate during sleep can dip as low as 40 bpm in healthy adults and well-trained athletes.
Average Sleeping Heart Rate by Age
Your heart rate during sleep varies with age, health, and physical fitness. Here’s a breakdown of average sleeping heart rates by age group:
| Age Group | Average Sleeping Heart Rate (bpm) |
|---|---|
| Newborns (0–1 mo) | 100–160 |
| Infants (1–12 mo) | 90–150 |
| Toddlers (1–3 yrs) | 80–130 |
| Preschoolers (3–5 yrs) | 70–120 |
| Children (6–12 yrs) | 60–100 |
| Teens (13–18 yrs) | 50–90 |
| Adults (18–60 yrs) | 40–70 |
| Older people (60+ yrs) | 40–70 |
These numbers reflect the slowing of the autonomic nervous system during non-REM sleep. Children and younger individuals naturally have higher heart rates due to higher metabolic needs.
What Should My Resting Heart Rate Be?
For most healthy adults, a normal resting heart rate is between 60 and 100 bpm. However, elite athletes may have resting rates as low as 40 bpm without any health concern.
Tip: A consistently low RHR usually indicates better cardiovascular efficiency. Higher RHR could suggest stress, dehydration, anemia, or an overactive thyroid.
What Is Heart Rate Normal?
The phrase “what is heart rate normal” often refers to typical ranges in different contexts:
| Activity Level | Normal Heart Rate Range (bpm) |
|---|---|
| At rest (adults) | 60–100 |
| During sleep (adults) | 40–70 |
| Light exercise | 90–120 |
| Moderate exercise | 120–150 |
| Intense exercise | 150–190 |
Always consider age, fitness, and medications when interpreting heart rate. For example, 103 pulse rate may be fine during mild activity, but high during sleep or rest.
How Heart Rate Changes During Sleep
Sleep occurs in cycles, and heart rate fluctuates throughout:
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Stage 1 (light sleep): Slight slowing of heart rate
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Stage 2: Further slowing
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Stage 3 (deep sleep): Lowest heart rate
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REM Sleep: Heart rate may rise closer to daytime resting levels due to increased brain activity
Irregular or unusually high sleeping heart rates during REM may be linked to poor sleep quality, nightmares, or undiagnosed sleep disorders.
What Can Affect Sleeping Heart Rate?
Several factors can raise or lower your heart rate during sleep:
Causes of Elevated Sleeping Heart Rate:
- Stress and anxiety
- Sleep disorders (e.g., sleep apnea)
- Caffeine or alcohol before bed
- Fever or infection
- Certain medications
- Pregnancy
Causes of Low Sleeping Heart Rate:
- Athletic conditioning
- Certain medications (e.g., beta blockers)
- Hypothyroidism
- Heart block or bradycardia
What Should My Heart Rate Be While Exercising?
Your target heart rate during exercise depends on age and fitness level. Use this formula to estimate your maximum heart rate:
220 – your age = Max HR
| Age | Target HR (Moderate Exercise: 64–76%) | Target HR (Vigorous Exercise: 77–93%) |
|---|---|---|
| 20 | 128–152 bpm | 154–186 bpm |
| 30 | 123–146 bpm | 147–176 bpm |
| 40 | 115–138 bpm | 139–167 bpm |
| 50 | 109–129 bpm | 130–159 bpm |
| 60 | 102–124 bpm | 125–153 bpm |
Pro Tip: If you’re unsure whether you’re working too hard, use the “talk test”—you should be able to speak, but not sing, during moderate activity.
Is a 103 Pulse Rate Dangerous?
A pulse rate of 103 bpm isn’t inherently dangerous—but its significance depends on context.
- If resting or sleeping: It’s considered high and may signal stress, dehydration, or illness.
- If exercising lightly: It may be normal.
- If persistent: Talk to your healthcare provider, especially if accompanied by symptoms like dizziness, shortness of breath, or fatigue.
How to Measure Your Sleeping Heart Rate
You can track your heart rate while sleeping using:
- Wearables: Smartwatches (e.g., Fitbit, Apple Watch) and rings (e.g., Oura, Belle Ring) measure heart rate and heart rate variability.
- Manual checking: Harder during sleep, but you can check resting heart rate first thing in the morning.
- Sleep studies: Ordered by a doctor if sleep apnea or other issues are suspected.
Tips for Managing and Lowering Sleeping Heart Rate
Want to maintain a healthy heart rate at night? Start with these strategies:
- Stick to a consistent sleep schedule
- Limit screen time before bed
- Practice relaxation techniques (meditation, deep breathing)
- Avoid caffeine/alcohol in the evening
- Exercise regularly
- Eat heart-healthy foods (e.g., omega-3s, leafy greens)
When to Talk to Your Doctor
Consult a healthcare professional if:
- Your resting or sleeping heart rate is consistently below 50 or above 100 bpm
- You experience symptoms like chest pain, dizziness, fatigue, or shortness of breath
- Your heart rate doesn’t drop during sleep
- You have existing heart conditions or are at risk for cardiovascular disease
Sleeping Heart Rate and Women’s Health
Sleeping heart rate is not static for women—it shifts across the menstrual cycle, pregnancy, and the menopause transition. In the luteal phase (the days before your period), rising progesterone often nudges resting and sleeping heart rate slightly higher, while the follicular phase tends to bring it back down. Pregnancy raises sleeping heart rate as blood volume increases, and during perimenopause and menopause, night sweats and hot flashes can cause brief overnight spikes. None of these patterns is something to diagnose from a single number—they are simply context that helps you read your own trend.
For more on how these signals behave over a cycle, see our guides to HRV for women and heart rate across the menstrual cycle, and how nighttime heart rate fits into the wider picture of tracking menopause symptoms.
Tracking Sleeping Heart Rate Trends With a Smart Ring
A smart ring is one of the most comfortable ways to see your sleeping heart rate night after night. Worn on the finger, the Belle Ring tracks trends in sleep, resting and sleeping heart rate, heart rate variability (HRV), skin temperature, SpO2 and stress, so you can spot when your baseline drifts up or down. Belle Ring is a wellness device—it surfaces patterns, not diagnoses, and it cannot replace a clinical assessment. If your overnight heart rate is consistently outside the ranges above, or you notice worrying symptoms, speak to a clinician. You can also read how your information is handled in our smart ring data privacy guide.
Frequently Asked Questions
What is a normal sleeping heart rate by age?
For most adults it sits between 40 and 70 bpm, while children and infants are naturally higher. Well-trained athletes can dip below 40 bpm without concern. Your personal baseline matters more than any single figure.
Why is my sleeping heart rate higher before my period?
Rising progesterone in the luteal phase commonly lifts resting and sleeping heart rate by a few beats per minute. This is normal physiology, not a warning sign on its own.
Can a smart ring measure my sleeping heart rate accurately?
A ring gives a convenient overnight estimate that is excellent for tracking trends over time, but it is not a medical-grade measurement and should not be used to diagnose any condition.
When should a high sleeping heart rate worry me?
If your sleeping heart rate is consistently above 100 bpm, never drops during the night, or comes with symptoms like chest pain, dizziness or breathlessness, contact a healthcare professional.
This article is for general information and is not medical advice. Belle Ring is a wellness device that tracks trends in metrics such as sleep, heart rate, HRV, skin temperature, SpO2 and stress; it does not diagnose, treat, or prevent any medical condition. If you have concerns about your heart rate or your health, please speak to a qualified clinician.