Evie Summers
Low oxygen variation during sleep, also known as hypoxemia, is a sleep disorder where blood oxygen levels fall to 88% or below for at least five minutes. This can be caused by sleep-related breathing disorders, such as sleep apnea, where a sleeper's breathing stops or slows down many times throughout the night, resulting in decreased oxygen intake. Sleep-related hypoxemia can also occur when blood oxygen levels drop during sleep due to reasons other than breathing difficulties. While minor changes in blood oxygen levels are typical during sleep, low oxygen saturation levels may indicate an underlying health issue.
| Characteristics | Values |
|---|---|
| Definition of low oxygen variation during sleep | Blood oxygen levels at or below 88% lasting for five or more minutes |
| Normal oxygen levels during sleep | 94-98% or more |
| Factors that influence oxygen levels during sleep | Sleeping position, altitude, pre-existing health conditions, sleep disorders, lung disorders, breathing disturbances, medications |
| Health risks of low oxygen levels during sleep | Tissues in the body may not get enough oxygen, increasing the risk of heart disease, dementia, and death |
| Treatment for low oxygen levels during sleep | Treatment depends on the underlying cause; for example, obstructive sleep apnea may be treated with a continuous positive airway pressure (CPAP) device, while sleep-related hypoxemia may be treated with supplemental oxygen |
| How to measure oxygen levels during sleep | Blood test, pulse oximeter, or sleep study (polysomnography) |
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What You'll Learn
Oxygen levels and sleep disorders
Oxygen levels in the blood tend to remain relatively constant, even during sleep. However, during sleep, breathing naturally slows and becomes less consistent, which can cause a slight drop in blood oxygen levels. While this is normal and not typically a cause for concern, if oxygen levels drop too low or remain low for extended periods, it could indicate an underlying health issue.
Blood oxygen levels below 88% are considered low and can be dangerous, as the body's vital organs may not be getting enough oxygen. This condition is called sleep-related hypoxemia, which is often caused by another health condition. Sleep-related hypoxemia can also occur when a person's blood oxygen saturation drops during sleep for reasons unrelated to breathing or sleep disorders.
Low oxygen levels during sleep can be a clinical indicator of sleep apnea, a disorder characterised by interruptions in breathing during sleep. Sleep apnea can cause oxygen levels to drop to 80% or lower, and if left untreated, can lead to high blood pressure, weight gain, and heart problems. Sleep apnea can be treated with positive airway pressure (PAP) therapy or, in severe cases, a continuous positive airway pressure (CPAP) device.
Genetics may also play a role in oxygen levels during sleep, as researchers have identified 57 genetic variations of the DLC1 gene associated with fluctuations in oxygen levels. These genetic variants influence lung fibroblast cells, which produce scar tissue in the lungs, suggesting a potential causal relationship between the gene and oxygen levels.
Wearable devices, such as the Apple Watch, Fitbit, and Oura Ring, can detect low oxygen saturation levels during sleep and may be useful in identifying sleep disorders or breathing disturbances. However, it is always recommended to consult a doctor for a proper assessment and diagnosis.
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Genetic factors
Low oxygen variation during sleep can be a result of various factors, including genetic ones. Obstructive sleep apnea (OSA), a sleep disorder caused by throat muscles relaxing and interfering with breathing, often leads to low oxygen levels in the bloodstream. People with OSA typically experience low oxygen levels during sleep due to gaps in their breathing patterns.
Genetics play a crucial role in understanding the variations in oxygen levels during sleep. Researchers have identified 57 genetic variations of a gene strongly associated with declines in blood oxygen levels during sleep. These genetic variations are linked to the severity of sleep apnea, a disorder that increases the risk of heart disease, dementia, and death. The study, published in the American Journal of Human Genetics, revealed that these genetic variations explained almost 1% of the variability in oxygen levels in European Americans, which is significant for complex genetic traits influenced by multiple variants.
The study's findings suggest that the DLC1 gene and its 57 variants are key factors in understanding oxygen level fluctuations during sleep. 51 out of these 57 genetic variants influence and regulate human lung fibroblast cells, which produce scar tissue in the lungs. This discovery highlights a potential causal link between the DLC1 gene's impact on fibroblast cells and changes in oxygen levels during sleep.
Furthermore, the research indicates a shared molecular pathway or a common mechanism that influences an individual's susceptibility to oxygen deprivation caused by sleep-disordered breathing and lung illnesses such as emphysema. By studying the genetic basis of this trait, scientists can better explain why some people are more prone to sleep-disordered breathing and its associated health risks.
In conclusion, low oxygen variation during sleep can be influenced by genetic factors, specifically the identified 57 genetic variations associated with sleep apnea and lung function. These findings contribute to our understanding of the role of genetics in oxygen level fluctuations during sleep and their potential impact on health outcomes.
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Altitude and oxygen levels
Altitude has a significant impact on oxygen levels during sleep. As altitude increases, the air becomes thinner and contains less oxygen, which can result in lower blood oxygen levels. This is particularly relevant for those living at high altitudes, who may experience lower-than-average oxygen saturation while sleeping.
The oxygen saturation level in the blood is a critical indicator of a person's health. Normal oxygen levels while sleeping typically range from 95% to 100% for healthy individuals. However, blood oxygen levels can vary slightly during sleep due to changes in sleeping positions or breathing patterns. Minor fluctuations are expected and usually not a cause for concern.
At high altitudes, individuals may experience lower blood oxygen saturation levels than those at sea level. The higher the altitude, the lower the average blood oxygen saturation. For example, a person living at a high altitude may have a lower-than-average oxygen saturation level, which could be within a normal range for their specific altitude.
It is important to monitor oxygen levels during sleep, especially for individuals with specific health conditions. Blood oxygen levels below 88% during sleep are considered low and may indicate a breathing issue such as sleep apnea or hypoxemia. Hypoxemia is characterised by blood oxygen levels falling below the normal range of 95% to 100%. Symptoms of mild hypoxemia include headache, shortness of breath, and rapid heartbeat. If oxygen levels drop to 81% or below during sleep, it is considered a medical emergency as the body's vital organs may not be receiving enough oxygen.
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Measuring oxygen levels
Blood oxygen levels can be measured through a blood test or by using a medical device called a pulse oximeter. A pulse oximeter is a small, painless clip typically placed on a person's fingertip. It can also be placed in parallel with a sensor that measures the pulse or heart rate. When worn over a prolonged period, such as during sleep, it can record blood oxygen levels continuously over time. A blood gas test is another way of measuring blood oxygen levels, but it requires a blood draw and can only be performed at a medical facility.
Over-the-counter pulse oximeters and smartphone-based devices have also been developed to check a person's blood oxygen level at home. However, experts warn that these non-prescription products haven't been thoroughly tested and shouldn't be used to monitor a person's health. In situations when a doctor does recommend using a pulse oximeter at home, such as in those with lung disease or COVID-19, the doctor can provide a prescription for an FDA-cleared pulse oximeter.
Sleep trackers can also be used to check blood oxygen levels. For example, the Oura Ring measures blood oxygen, heart rate, and heart rate variability along with key sleep metrics.
Doctors often look at trends in a person's blood oxygen level rather than a single measurement. For example, even an oxygen level of 95% could be a cause for concern in a person who previously had a blood oxygen level of 98%. High elevations can also cause a person's blood oxygen to be lower than it would be at sea level. Blood oxygen levels may also be lower in people who have been diagnosed with health issues that affect the lungs, like chronic obstructive pulmonary disorder (COPD) or pneumonia. Additionally, pulse oximeters provide only estimates of blood oxygen, and readings can be several percentage points different from a person's actual level.
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Treatment for low oxygen levels
Low oxygen levels during sleep, also known as hypoxemia, can be caused by a variety of factors, including sleep disorders such as sleep apnea, sleep-related hypoventilation, and certain medications. Sleep apnea, in particular, is characterised by interruptions in breathing during sleep, which can result in decreased oxygen levels in the blood.
If you suspect you are experiencing sleep-related breathing difficulties, it is important to consult a doctor. They will be able to assess your symptoms, medical history, and, if necessary, recommend further testing, such as a sleep study or polysomnography. This can help determine if your low oxygen levels during sleep are indicative of an underlying condition.
One common treatment for low oxygen levels during sleep caused by sleep apnea is positive airway pressure (PAP) therapy. PAP therapy aims to correct breathing problems associated with sleep apnea, thereby preventing drops in blood oxygen levels. This treatment has also been linked to reducing the risk of late-onset epilepsy, which is three times more likely to occur in individuals with oxygen saturation below 80% during sleep.
In addition to PAP therapy, addressing underlying lung issues can help improve oxygen levels during sleep. Lung disorders, such as emphysema, can further decrease oxygen levels at night, so treating these conditions is crucial. Furthermore, researchers have identified 57 genetic variations of the DLC1 gene associated with oxygen level fluctuations during sleep. This knowledge can help identify individuals who may be more susceptible to sleep disordered breathing and develop targeted treatments.
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Frequently asked questions
Low oxygen variation during sleep could mean that your body is not getting enough oxygen while you sleep. This could be due to sleep-related breathing disorders, such as sleep apnea, or other health conditions.
Sleep apnea is a sleep disorder in which a person's breathing stops or slows many more times than what is normal throughout the night. This results in lower levels of oxygen in the blood, also known as hypoxemia.
Symptoms of sleep apnea include heavy snoring, feeling sleepy during the day, and low oxygen saturation levels on a wearable device.
Treatment for sleep apnea depends on the severity of the condition. Mild cases may be treated with a custom-made oral device (OAT), while more severe cases may require a continuous positive airway pressure (CPAP) device or positive airway pressure (PAP) therapy.
If you are concerned about your blood oxygen levels during sleep, you should contact your doctor. Only a healthcare provider can assess changes in blood oxygen levels and determine if testing or treatment is necessary.
