Best Pulse Oximeter for Overnight Monitoring (Reviews and Buying Guide)

Are you looking for a pulse oximeter to track your overnight oxygen? Are you overwhelmed by the number of different types of pulse oximeters that are out there?

Look no further because I’ve done some extensive research into pulse oximeters and their use for tracking oxygen while sleeping. Here I’ll recommend the best pulse oximeter for overnight monitoring and also some great alternatives for you to consider.

Best Pulse Oximeter for Overnight Monitoring Reviews

1. Wellue O2Ring

wellue o2ring oxygen monitor

The Wellue O2Ring is top of the line, and I consider it to be the best pulse oximeter for overnight monitoring.

Let’s take a look at the features of the Wellue O2Ring:

  • It’s designed to fit over the thumb or finger. According to this study done in 2015, the best place to wear a pulse oximeter for the most accurate readings is the right middle finger, and the second best place is the right thumb. The ring fit of the Wellue O2Ring also leaves the rest of your hand free for movement, so you don’t feel constrained at all. Additionally, because it fits like a ring, it stays on securely throughout the night, doesn’t slip off, and you don’t have to worry about any wires getting disconnected. The ring perimeter is 2-3.2 inches (50-82 mm) and adjusts to fit all sorts of finger sizes within this range.
  • It’s the perfect size for overnight use. It’s sleek, lightweight, and not bulky, making it super comfortable to wear while sleeping.
  • The Wellue O2Ring is designed for continuous monitoring overnight. It continuously tracks oxygen levels, pulse rate, and motion every second, gathering an impressive amount of data in a typical night. It has a built-in memory for data collection, but data can also be stored using the Android or iOS app or the Mac or PC software.
  • The app or software that comes with the Wellue O2Ring provides overnight oximetry interpretation and gives you access to detailed analysis reports of blood oxygen levels, heart rate, and body movements. It produces high resolution trend charts with 4-second intervals. You can also easily generate professional PDF or CSV reports to instantly send to your doctor for further analysis. But don’t let all of that data talk overwhelm you! The reports are easy to read, if you have the right guidance. Click here to see my guide to how you should be interpreting these results (bookmark this page to refer to once you get your new pulse oximeter!).
  • The Wellue O2Ring also has a fantastic alarm feature. It vibrates when low oxygen levels or abnormal heart rate is detected. Even further, the vibration feature can be customized by intensity of vibration, what you want it to vibrate for (like your oxygen, heart rate, or both), and at what threshold for each. An added benefit of the vibration alarm is that if you’re wearing it while sharing a bed with your partner, it only wakes you up (unlike a sound alarm, which might wake up your partner).
  • Recharging the Wellue O2Ring is easy, as it only requires USB connection.
  • The battery life of 12-16 hours is more than sufficient, and you can get about two night’s use out of it before it needs a recharge.

2. Wellue Oxylink

wellue oxylink ring oxygen monitor

The Wellue Oxylink is an excellent lower cost option that still gives you the best features for overnight pulse oximeter monitoring.

Let’s check out the features of the Wellue Oxylink:

  • It fits like a ring, which I think is the best sort of fit for overnight pulse oximetry. This way, it stays on securely, you have room to move your hand around, and you don’t have to worry about any wires disconnecting as you move while you sleep. That being said, the main unit is longer and a bit bulkier compared to the Wellue O2Ring. For this reason, I think you can only really wear it comfortably on your thumb. Unlike with the Wellue O2Ring, which you can wear on your thumb or finger..
  • The ring is made of soft, silicone material, which is pretty comfortable to wear while you sleep. However, I don’t think this is quite as sturdy and durable as the thicker ring of the Wellue O2Ring.
  • It’s designed for continuous monitoring overnight. It continuously tracks oxygen levels, pulse rate, motion, and perfusion index (PI) every second, gathering an impressive amount of data in a typical night. It has a built-in memory for data collection of 4 sessions of up to 10 hours each.
  • Unfortunately, unlike the Wellue O2Ring, it doesn’t have compatible PC or Mac software for you to view your data and reports on your computer. However, you can view these details on your phone using the Android or iOS app. The app provides overnight oximetry interpretation and gives you access to detailed analysis reports of blood oxygen levels, heart rate, and body movements. It produces high resolution trend charts with 1-minute intervals (unlike the Wellue O2Ring, where you get 4-second intervals for an even more accurate report). You can also easily generate professional PDF or CSV reports to instantly send to your doctor for further analysis. Remember to check out my guide on how to interpret your results.
  • It has an alarm feature, which is great. But unlike the Wellue O2Ring, you can only set it to go off for oxygen levels and not heart rate, and it’s an audible alarm and not a vibration alarm. However, you can still customize the volume of the alarm and at what range you want it to go off at if oxygen levels are low.
  • Easy recharge with USB connection and a battery life of 12-16 hours.

3. Wellue SleepU

wellue sleepu wrist oxygen monitor

The Wellue SleepU is also an exceptional overnight pulse oximeter option. It has almost all of the same key features as the Wellue O2Ring aside from a few small differences.

Let’s take a look at the features of the Wellue SleepU:

  • The device is strapped onto your wrist with an adjustable strap, which is connected to a ring sensor that’s worn on your finger or thumb. The perimeter of the ring sensor is slightly smaller than the Wellue O2Ring, at a range of 2-3 inches (50-76 mm). In my opinion, it’s this type of fit that makes this device slightly more inferior to the Wellue O2Ring. There’s a risk that the wire between the ring sensor unit strapped to your wrist can be disconnected while you sleep, which can lead to incomplete readings.
  • It’s designed for continuous monitoring the same way as the Wellue O2Ring, collecting oxygen levels, pulse rate, and motion every second.
  • It has the same built-in memory features, app and computer software features, and analysis report features of the Wellue O2Ring.
  • It only vibrates when blood oxygen levels are low (as opposed to the Wellue O2Ring, which can be set to vibrate for blood oxygen levels and/or heart rate). This alarm is still customizable though, as you can adjust the vibration intensity and threshold for oxygen level.
  • It has a great battery life of 16 hours, so it should last you a few nights before having to recharge it.

4. Contec CMS50F

contect cms50f wrist oyxgen monitor

he Contec CMS50F is a great option for overnight pulse oximetry tracking. Let’s take a lot at its features:

  • It fits like the Wellue SleepU, strapping to the wrist which is connected by a wire to a ring sensor that’s worn on the finger. As I mentioned before, I’m not a big fan of this design, as I think the wire can disconnect overnight as you move while sleeping.
  • It does not have wireless Bluetooth capability like all of the other pulse oximeters included in this review. However, it does have a built-in memory and comes with a cable that you can use to upload your data to your computer.
  • Continuously tracks oxygen levels and heart rate and can do this for up to 24 hours.
  • It has an audible alarm that goes off when oxygen levels and/or heart rate are low.
  • Though there’s no phone app, you can transfer your data to your computer and view detailed analysis reports.

Pulse Oximeter for Overnight Monitoring Buying Guide

Fit: Ring vs. Wrist

How the pulse oximeter fits while sleeping is an important factor to consider. Overall, the ring pulse oximeters are smaller and less bulky, which I think makes them more comfortable to wear at night. Also, the wrist pulse oximeters have a wire that attach to a ring sensor that you wear on your finger or thumb. This is up to you whether you think you’d find this more comfortable or not compared to a ring, but I think you should consider the possibility of the wire disconnecting while you sleep.

Data Collection and Analysis Reports

All of these pulse oximeters continuously track your oxygen level and pulse rate. They all also have a built-in memory to store the data collected overnight and give you analysis reports to help you understand your results even better. What’s important to consider here is wireless capability for transferring data (the Contec CMS50F doesn’t have this and comes with separate cable to upload your data).

Phone App and Computer Software Capability

Another factor to consider is how you prefer to view your data, whether it’s on your phone or on your computer. And if you have a Mac, I should point out that the Contec CMS50F is not compatible with Macs.

Alarm

You should also think about your alarm preferences when comparing these pulse oximeters. Some have vibration alarms while others have audible alarms. If you’re planning to use the pulse oximeter for overnight monitoring and share a bed with a partner, audible alarms aren’t ideal because they can wake up your partner too.

Pulse Oximeter for Overnight Monitoring Comparison Chart

 Wellue O2RingWellue OxylinkWellue SleepUContec CMS50F
FitRing fit, fits on thumb or fingerRing fit, fits on thumbStraps to wrist, connects to ring sensor with a wireStraps to wrist, connects to ring sensor with a wire
Weight15 g (0.52 oz)18 g (0.63oz)31 g (1.09 oz)47.3 g (1.67 oz)
Wireless CapabilityYes, BluetoothYes, BluetoothYes, BluetoothNo, comes with download cable for transferring data to computer
Continuous MonitoringContinuously tracks oxygen levels and heart rate every secondContinuously tracks oxygen levels and heart rate every secondContinuously tracks oxygen levels and heart rate every secondContinuously tracks oxygen levels and heart rate
Oxygen Level Range70-99%70-100%70-99%N/A
Heart Rate Range30-250 bpm30-250 bpm30-250 bpmN/A
Alarm/notificationSilent vibration alarmAudible alarmSilent vibration alarmAudible alarm
Customizable AlarmOn/off; Adjustable vibration intensity and threshold of blood oxygen and heart rateOn/off; Adjustable alarm volume and threshold of blood oxygen only (not heart rate)On/off; Adjustable vibration intensity and threshold of blood oxygen onlyOn/off; Can use for blood oxygen and heart rate
Printable/shareable ReportsPrint/share professional PDF/CSV analysis report of oxygen levels and heart ratePrint/share professional PDF/CSV analysis report of oxygen levels and heart ratePrint/share professional PDF/CSV analysis report of oxygen levels and heart ratePrint/share professional analysis report of oxygen levels and heart rate
Phone App CompatibilityYesYesYesNo
PC/Mac SoftwareYesNo, phone app onlyYesPC only
Display Interval in Reports4 seconds1 minutes4 secondsN/A
BatteryRechargeable via USB with 12-16 hours battery lifeRechargeable via USB with 12-16 hours battery lifeRechargeable via USB with 16 hours battery lifeRechargeable via USB, lasts ~24 hours in record mode
Built-in MemoryYes, 4 sessions up to 10 hours eachYes, 4 sessions up to 10 hours eachYes, 4 sessions up to 10 hours eachYes
Water ResistantYes, IP24Yes, IP64Yes, IP24N/A
PriceCheck PriceCheck PriceCheck PriceCheck Price

Best Pulse Oximeter for Overnight Monitoring Summary

wellue o2ring oxygen monitor

Overall, the Wellue O2Ring is my number one pick. The Wellue O2Ring is designed for the purpose of overnight oxygen monitoring. It has all of the features you need and does them the best out of these four pulse oximeters.

If you’re looking to spend less, then my recommendation would be the Wellue Oxylink. It has all of the important features you need, and is an excellent low-cost option.

Hopefully this review and buying guide helped you decide which of these is the best pulse oximeter for overnight monitoring for you.

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