Ashwin Lewis
Sleep tracking devices have become increasingly popular, with many people using them to monitor their sleep quality and duration. These devices can also monitor heart rate and oxygen consumption, providing insights into the connection between sleep and heart rate. Heart rate is influenced by various factors such as activity levels, emotions, stress, and exercise. During sleep, heart rate typically slows down and continues to decrease as an individual progresses from light sleep to deep sleep. However, during the REM stage, heart rate may speed up, sometimes reaching levels similar to when one is awake. This variability in heart rate during sleep can be measured and analyzed through electrocardiogram (ECG) recordings, helping to understand the dynamics of heart rate and sleep stages. While sleep trackers provide valuable insights, they offer estimates rather than precise data, and a medical sleep study is required for an exact analysis of sleep habits and heart rate fluctuations.
| Characteristics | Values |
|---|---|
| Heart rate during sleep | It is normal for the heart rate to slow down during sleep |
| Factors affecting heart rate during sleep | Sleep progresses through various stages, including light sleep, deep sleep, and REM sleep. The heart rate is the lowest during deep sleep and may speed up during REM sleep. |
| Heart rate monitoring devices | Sleep tracking devices can be used to monitor heart rate during sleep. Examples include wearable devices like the Oura Ring and the Sleep Cycle app. |
| Normal sleeping heart rate | A normal sleeping heart rate is between 40 and 50 bpm. |
| Anomalies in heart rate | A resting heart rate lower than 50 bpm or higher than 100 bpm could be a cause for concern and should be discussed with a doctor. |
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What You'll Learn
Heart rate during light sleep
Sleep is not just the absence of wakefulness but a regulated process with an important restorative function. During sleep, the stimulation of the nervous system is reduced, and most body processes slow down. The heart rate, blood pressure, and respiratory rate are lowered to adapt to the reduced metabolic needs during normal sleep. Consequently, the mean heart rate values drop from wakefulness to light sleep and further to deep sleep.
Within about five minutes after drifting off to sleep, the heart rate gradually slows to its resting rate as one enters light sleep. People typically spend about half the night in light sleep, and between the two distinct phases of light sleep (sleep stages one and two), one may spend up to 60% of their night in light sleep.
During REM sleep, the heart rate increases again, showing high variability, which may exceed the variability observed during quiet wakefulness. Dr Epstein says, "Your heart rate can vary quite a bit during REM sleep because it reflects the activity level occurring in your dream. If your dream is scary or involves activity such as running, then your heart rate rises as if you were awake."
Sleep stages and intermediate wake states have different distributions of their duration, and this allows for the creation of a model for the temporal sequence of sleep stages and wake states. Heart rate is easily accessed with high precision by the recording and analysis of the electrocardiogram (ECG).
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Heart rate during deep sleep
Sleep is not just the absence of wakefulness but a regulated process with an important restorative function. During sleep, the stimulation of the nervous system is reduced and most of the body's processes slow down. The heart rate is no exception to this, as it is normal for it to slow down during sleep.
Heart rate varies depending on the phase of sleep a person is in. In the first stages of light sleep, the heart rate begins to slow down. During deep sleep, the heart rate reaches its lowest level, falling to about 20% to 30% below the resting heart rate. Blood pressure also falls during this stage.
During rapid eye movement (REM) sleep, the heart rate may speed up to a level similar to when a person is awake. This is because the heart rate reflects the activity level occurring in the dream. For example, if a person is running in their dream, their heart rate will increase as if they were running while awake. The variability in heart rate during REM sleep may even exceed the variability observed during quiet wakefulness.
It is important to monitor one's heart rate, especially if one experiences irregular heart rates or other symptoms such as chest pain, shortness of breath, heart palpitations, or feeling faint. These could be signs of trouble and should prompt a call to a doctor. Additionally, those with diabetes, high blood pressure, or high cholesterol should be especially careful in monitoring their heart rate.
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Heart rate during REM sleep
Sleep is a dynamic state of consciousness characterised by rapid fluctuations in autonomic activity controlling coronary artery tone, systemic blood pressure, and heart rate. During non-REM sleep, an individual's heart rate, breathing, and blood pressure all drop to levels below those that occur while they are awake.
During REM sleep, however, both an individual's blood pressure and heart rate can fluctuate and vary. REM sleep is also known as "dreaming sleep", and an individual's heart rate during this phase can vary depending on the activity level occurring in their dream. For example, if an individual's dream involves physical activity, such as running, their heart rate rises as if they were awake. These fluctuations in heart rate during REM sleep can sometimes exceed the variability observed during quiet wakefulness.
The transition to REM sleep causes a decrease in vagal contribution to heart rate control, resulting in a relative prevalence of low-frequency variability of heart rate. This can be interpreted as a condition of sympathetic dominance in the autonomic balance during REM sleep.
Scientific studies have shown a direct connection between sleep, sleep disorders, and heart disease. There is an increased risk of sudden cardiac death within several hours of waking up, as there is an increased work demand on the heart upon waking. People with sleep-related breathing disorders, such as central sleep apnea (CSA) or sleep apnea, are more likely to have high blood pressure and are at a higher risk of heart disease and stroke.
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Sleep tracking devices
- Sleep duration: These devices can record when you fall asleep and wake up by tracking periods of inactivity.
- Sleep quality: They can detect interrupted sleep, indicating when you toss and turn or wake up during the night.
- Sleep phases: Certain trackers monitor the different phases of sleep, including light sleep, deep sleep, and REM sleep. This allows the device to time alarms for when you're sleeping more lightly, making it easier to wake up.
- Environmental factors: Some trackers record environmental conditions like light and temperature in the bedroom, which can impact sleep quality.
- Lifestyle factors: Trackers may prompt you to input lifestyle choices that affect sleep, such as caffeine intake, meal times, and stress levels.
Popular sleep-tracking devices include the Whoop, Oura Ring, Google Pixel Watch, Ultrahuman Ring AIR, and Elemind. These devices offer insights into overall health by monitoring sleep, vitals, workouts, and more. While they provide a wealth of data, it's important to remember that they are not a substitute for medical advice, and any concerns about sleep quality should be discussed with a healthcare professional.
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Lifestyle factors
Physical Activity and Exercise: Regular physical activity and exercise can lower resting heart rate. This is because exercise strengthens the heart muscle, enabling it to pump a larger volume of blood with each heartbeat. Consequently, more oxygen is delivered to the muscles, reducing the need for the heart to beat as frequently compared to someone who is less fit. This adaptation leads to a lower heart rate during sleep.
Emotional State: Intense emotions, such as fear, anger, or surprise, can cause heart rate spikes during waking hours. These emotional responses can also impact the heart rate during sleep, particularly during the REM (rapid eye movement) phase, where dreams can induce similar emotional reactions. Scary or active dreams can cause an increase in heart rate as if the person were awake.
Sleep Quality and Sleep Disorders: Sleep quality and the presence of sleep disorders can influence heart rate during sleep. For example, individuals with sleep apnea, a condition characterized by upper airway obstruction, can experience hundreds of apnea events in a single night, leading to cardiovascular changes. Each apnea event is associated with a decrease in heart rate, followed by an increase in heart rate and blood pressure as respiration resumes.
Age: Age is a critical factor in heart rate during sleep. As people age, their resting heart rate tends to decrease. This is known as bradycardia, and while it may be normal for some older adults, it could also indicate underlying health issues. In contrast, children tend to have higher heart rates than adults, and their heart rates gradually slow down as they grow older.
Other Health Conditions: Various health conditions can impact heart rate during sleep. For example, underlying conditions such as heart disease, rheumatic fever, Lyme disease, anorexia, hypothyroidism, and sleep apnea can contribute to lower heart rates. Additionally, certain substances and medications may also influence heart rate. It is important to consult a medical professional to address any underlying conditions that may affect sleeping heart rate.
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Frequently asked questions
A sleep cycle heart rate monitor is a device that can track your sleep duration and quality by measuring your heart rate and blood pressure. These devices can be worn on the wrist, clipped to a pillow, or placed on a bedside table.
Sleep cycle heart rate monitors work by measuring your heart rate and blood pressure during sleep. They can detect when you fall asleep and when you wake up by tracking your movement and heart rate. Some monitors also measure oxygen consumption and the number of steps taken per day.
Sleep cycle heart rate monitors can help you understand your sleep patterns and habits. They can also detect interrupted sleep and let you know if you are tossing and turning during the night. Additionally, these monitors can provide insights into your overall health and help detect any heart rate irregularities.
While sleep cycle heart rate monitors can collect a lot of information about your sleep habits, they do not directly measure sleep. Instead, they estimate sleep based on inactivity. For exact data about your sleep habits, a medical sleep study that monitors brain waves is required.
Yes, there are alternative methods to track your sleep and heart rate. One option is to participate in a medical sleep study, which can provide more accurate data about your sleep cycles and heart rate variability. Additionally, some smartphone applications, such as the Sleep Cycle app, offer heart rate tracking features when granted permission to use the phone's camera.
