Why is SpO₂ important at night?
Your SpO₂ level shows how much oxygen your blood is carrying, helping you understand if your body is getting enough oxygen.
Let’s take a closer look.
Learn more about blood oxygen saturation
While you sleep, your body continues working, and SpO₂ (blood oxygen saturation) is one of the signals that can be monitored overnight.
Tracking your oxygen levels during the night can help identify drops that may occur while you sleep. Repeated drops in oxygen levels can be associated with breathing disturbances that may disrupt your sleep.
What is SpO₂ and why does it matter?
SpO₂ measures the percentage of oxygen in your blood. It is a key indicator of how well your body is being oxygenated, and it plays a pivotal role in ensuring your organs and tissues receive the oxygen they need to function optimally ¹.
Stable oxygen levels during sleep generally indicate that your blood is carrying oxygen effectively. Drops or repeated fluctuations may be linked to breathing disturbances at night or other factors that can affect your sleep.
How should you interpret your SpO₂ percentage?
In healthy individuals, blood oxygen levels typically range between 95% and 100%, whether asleep or awake².
However, prolonged or repeated breathing interruptions during sleep can cause oxygen levels to drop. Blood oxygen saturation during sleep is generally considered low if it falls below 95%. Medical attention may be recommended if it drops below 92%3.
Visualizing your SpO₂ overnight helps you understand how your oxygen levels change while you sleep.
Spotting patterns: what affects your SpO₂ levels?
Think about the nights when you wake up feeling especially refreshed.
Was there a connection between your SpO₂ levels and:
- Wearing your Narval CC device?
- A particular sleep position?
- Specific environmental conditions?
Taking a moment to consider these factors can help you better understand how they influence your sleep quality over time.
Use the myNarval app to visualize and reflect
Your SpO₂ data is available in the myNarval app, along with notes about your sleep and device use. Over time, you’ll gain personalized insights into what supports your experience, and what may disrupt it.
Important Notice
This article provides general information about medical conditions. It does not constitute medical advice. If you have medical questions, please consult your physician.
Legal Notice
myNarval is not a medical device. Please refer to the Narval CC Instructions for Use for important information regarding contraindications, warnings, and precautions to be taken before and during product use.
Clinical References
- National Library of Medicine (NLM). Chapter 2: The Circulatory System and Oxygen Transport. San Rafael (CA): Morgan & Claypool Life Sciences; 2011.
- American Thoracic Society. Pulse Oximetry.
- Hafen BB, Sharma S. Oxygen Saturation. Updated November 23, 2022. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; January 2025.
- National Library of Medicine (NLM). Sleep Physiology. Treasure Island (FL): StatPearls Publishing; January 2023.