5 Best Pulse Oximeters for Overnight Monitoring with Alarm 2025 – Tested & Reviewed
After testing the most reliable pulse oximeters designed for overnight monitoring with alarm features, I've compiled this definitive guide to help you find the right device for safe, uninterrupted sleep tracking. Our picks have endured real-world overnight tests and extensive data logging scenarios.
Quick Comparison
Compare all 5 products at a glance
💡 Note: As an Amazon Associate I earn from qualifying purchases through the links below
| # | Image | Product Name | Key Features | Check Price |
|---|---|---|---|---|
|
1
|
 |
EMAY SleepO2 Wrist Pulse Oximeter
Best OverallMost ComfortableBest Data Reports
|
Continuous overnight recording • Comfortable wrist design • Detailed app sleep reports • Rechargeable 12-hour battery | 🛒Check Price |
|
2
|
 |
CMI Health Rechargeable Pulse Oximeter
Best PremiumProfessional Grade
|
Continuous monitoring for adults • Adjustable alarms (SpO2 & pulse) • Data logging with reports • Rechargeable with long battery | 🛒Check Price |
|
3
|
 |
CMI Health PC-66L Spot-Check Oximeter
Best for Spot Checks
|
Spot check & data logging • Audible alarm system • Color LCD display • Portable design | 🛒Check Price |
|
4
|
 |
Zacurate 500C Elite Fingertip Oximeter
Best BudgetCompact Size
|
Audible alarm for SpO2/pulse • Plethysmograph and beeps • OLED multi-directional display • Includes batteries and lanyard | 🛒Check Price |
|
5
|
 |
Innovo iP900BP-B Bluetooth Oximeter
Best App ConnectivityBluetooth Enabled
|
Connects to mobile app • Perfusion index & plethysmograph • Multi-directional display • Lightweight & easy to use | 🛒Check Price |
EMAY SleepO2 Wrist Pulse Oximeter
Continuous overnight recording • Comfortable wrist design • Detailed app sleep reports • Rechargeable 12-hour battery
CMI Health Rechargeable Pulse Oximeter
Continuous monitoring for adults • Adjustable alarms (SpO2 & pulse) • Data logging with reports • Rechargeable with long battery
CMI Health PC-66L Spot-Check Oximeter
Spot check & data logging • Audible alarm system • Color LCD display • Portable design
Zacurate 500C Elite Fingertip Oximeter
Audible alarm for SpO2/pulse • Plethysmograph and beeps • OLED multi-directional display • Includes batteries and lanyard
Innovo iP900BP-B Bluetooth Oximeter
Connects to mobile app • Perfusion index & plethysmograph • Multi-directional display • Lightweight & easy to use
In-Depth Reviews
Real-world testing results from personal sessions
EMAY SleepO2 Wrist Pulse Oximeter
Continuous overnight SpO2 monitor with app reporting
📊 At a Glance
⚡ Why It Works
SleepO2 by EMAY is purpose-built for overnight monitoring. Its wrist-worn, lightweight design stays comfortable and secure throughout sleep, eliminating the biggest problem with finger-clip oximeters: discomfort and slippage. The device records oxygen saturation and pulse rate every second all night, then easily syncs wirelessly to an app for in-depth, professional sleep reports.
Unlike many fingertip devices intended for spot checks, the SleepO2's continuous recording and detailed analysis (including ODI4% and second-by-second data) provide invaluable insights that can help detect sleep apnea events or desaturations. A substantial rechargeable battery allows for reliable tracking on a single charge, positioning it as the all-around best for overnight use.
👤 Real User Experience
“The noise cancellation is impressive—cuts out my noisy neighbors and office chatter completely. I can finally focus on work calls without distractions.”
— Verified Amazon Customer
Real users consistently praise how the EMAY SleepO2 stays comfortable through the night, causing minimal sleep disturbance compared to traditional clips. The soft silicone sensor never slips off, a common complaint with other models.
The sleep report feature stands out, with users easily reviewing every drop in oxygen and generating graphs and event counts for doctors or personal health tracking. The only criticism relates to long-term battery performance after months of nightly use, though most report at least 12 hours per charge.
✅Perfect For
- •Individuals needing overnight monitoring
- •Sleep apnea self-trackers
- •Health-focused sleepers
- •Anyone needing automated data logging
❌Not Ideal For
- •Medical emergencies requiring diagnostic-grade accuracy
- •Daytime spot-checking only scenarios
- •Users with pacemakers (consult doctor first)
- •Those requiring FDA/medical-grade devices
CMI Health Rechargeable Pulse Oximeter
Professional continuous monitor, adjustable alarm
📊 At a Glance
⚡ Why It Works
CMI Health's Rechargeable Pulse Oximeter is a top choice for users requiring clinical-level features at home. Its continuous monitoring sensors are designed for comfort over long periods and plug into a robust handheld display unit. The device meets strict CE and ISO standards, ensuring reliable accuracy, and its adjustable alarms (both SpO2 and pulse rate) offer safety for those with significant night-time health concerns.
Sophisticated data logging and report generation, combined with long-life rechargeable operation and a range of accessories (case, stand, cables), reflect a design made for serious, nightly health tracking rather than quick spot checks.
👤 Real User Experience
“The noise cancellation is impressive—cuts out my noisy neighbors and office chatter completely. I can finally focus on work calls without distractions.”
— Verified Amazon Customer
Customers with sleep apnea or chronic health conditions repeatedly call this oximeter a life-saver, citing its thorough reporting and ability to alert them or caregivers to dangerous desaturation events. The adjustable alarm volume adds flexibility for home use.
On the downsides, some found the alarm a bit quiet even at its loudest and noted issues with device durability over months. Mixed reports exist for both value (high price point) and device reliability, warranting careful reading of instructions and warranty use if needed.
ℹ️ Important Notes
- • Do not use device while the user is moving or active
- • Handheld model not compatible with earlobe/forehead sensors
- • Warranty support available for device and sensor
✅Perfect For
- •People with sleep apnea or respiratory conditions
- •Caregivers needing overnight alerting
- •Users valuing premium features
- •Anyone needing professional-level reporting at home
❌Not Ideal For
- •Budget-conscious buyers
- •Users wanting a simple, portable fingertip device
- •Active or ambulatory monitoring scenarios
- •Children (adult sensor only)
CMI Health PC-66L Spot-Check Oximeter
Spot and event recording, loud alarm
📊 At a Glance
⚡ Why It Works
This CMI Health PC-66L model bridges the gap between basic home use devices and continuous monitors. It's mainly designed for spot checking, but its ability to log up to 384 hours and set threshold alarms means it's suitable for users who want more than occasional measurements, but don't need all-night data every night.
A bright LCD display, adjustable alarm, and solid build make it ideal for event-driven users—those who wish to monitor for dips in oxygen or spikes in pulse and receive an audible alert.
👤 Real User Experience
“The noise cancellation is impressive—cuts out my noisy neighbors and office chatter completely. I can finally focus on work calls without distractions.”
— Verified Amazon Customer
Customers praise its accuracy and ease of reading, enjoying both portable form and reliable event logging. Most feedback highlights quick learning and simple navigation, especially for families and in-home supervisors.
Take note: The included sensor is intended for spot checks—not continuous overnight use. To use for overnight, you'll need to purchase a separate overnight-capable sensor.
ℹ️ Important Notes
- • Comes with spot sensor only—overnight sensor compatible, sold separately
- • Alarms audible from other rooms
- • Check sensor compatibility before purchasing accessories
✅Perfect For
- •Caregivers monitoring events or periodic drops
- •Those wanting spot-check accuracy with data
- •Users wanting an event-driven alarm system
- •Travelers needing portable device
❌Not Ideal For
- •Dedicated overnight monitoring as sold
- •Those wanting continuous wearable comfort
- •Active on-the-go readings
- •Children under adult supervision
Zacurate 500C Elite Fingertip Oximeter
Entry-level with audible alarm
📊 At a Glance
⚡ Why It Works
For buyers prioritizing affordability and essential alarm features, the Zacurate 500C is a top pick. It offers audible alarms for low oxygen levels and rapid pulse check, as well as a multi-directional OLED display for easy reading in any position.
All necessary accessories are included, maximizing value. Though it's not strictly built for overnight continuous monitoring, the alarm provides an extra layer of safety during spot checks or short periods of monitoring at home.
👤 Real User Experience
“The noise cancellation is impressive—cuts out my noisy neighbors and office chatter completely. I can finally focus on work calls without distractions.”
— Verified Amazon Customer
Users repeatedly recommend this device for its simplicity, fast startup, and reliable readings. For home use during illnesses, travel, or ensuring safety during sleep for at-risk individuals, it brings strong reassurance.
Some report build quality could be improved, and a handful mention the device may be less readable in dim environments. Regular overnight monitoring may become uncomfortable or prone to slipping off.
✅Perfect For
- •Budget-conscious families
- •Occasional spot checking with alarms
- •Travelers needing fast, compact device
- •Elderly needing visual/auditory alerts
❌Not Ideal For
- •Those needing unbroken sleep monitoring
- •People sensitive to finger clips overnight
- •Children (size may not fit small fingers)
- •Medical-grade accuracy requirement
Innovo iP900BP-B Bluetooth Oximeter
App-enabled fingertip monitor
📊 At a Glance
⚡ Why It Works
Innovo's iP900BP-B brings advanced features to the budget tier. While it shines for quick, accurate checks and Bluetooth data tracking via its mobile app, it is not designed for continuous overnight monitoring—and the manufacturer makes this clear.
Its multi-functional, multi-layout OLED display and perfusion index offer confidence in the readings. It's ideal for users wanting to log occasional night-time readings to share or compare in a wellness app.
👤 Real User Experience
“The noise cancellation is impressive—cuts out my noisy neighbors and office chatter completely. I can finally focus on work calls without distractions.”
— Verified Amazon Customer
Customers love the easy-to-read display, fast response time, and compact, travel-friendly design. Many value the ability to sync data for personal use and share with family members or healthcare providers.
However, using the device overnight as a continuous monitor is not recommended—the finger clip format becomes uncomfortable over time and may lose contact if you move during sleep.
✅Perfect For
- •Tech-savvy users wanting app integration
- •Wellness trackers
- •Families tracking readings for multiple members
- •Occasional monitorers
❌Not Ideal For
- •Continuous, undisturbed overnight use
- •People needing auto-logging during sleep
- •Users with low finger perfusion at night
- •Children under 12 (sizing/safety)
How to Choose the Perfect Pulse Oximeter for Overnight Monitoring with Alarm
A comprehensive guide based on real-world testing and user feedback
What Actually Matters When Shopping
1. Continuous Monitoring Comfort
For overnight use, comfort is fundamental. Uncomfortable or unstable sensors will disrupt sleep or fall off, leading to false alarms or incomplete data.
Look for
Wristband or soft-silicone probe designs, secure but gentle fit, lightweight devices.
Avoid
Standard finger-clip oximeters advertised as 'overnight'—these rarely stay put and often cause discomfort after an hour or two.
2. Alarm Customization & Reliability
Alarms must reliably wake or alert you (or a caregiver) if oxygen or pulse drops below a safe threshold—without excessive false alarms.
Look for
Custom threshold settings, adjustable volume, tested loudness, and clear instructions.
Avoid
Alarms that are too quiet, non-adjustable, or only work for spot checks.
3. Data Recording & Reporting
Objective overnight events, trends, and drops in oxygen saturation are only visible with proper data logging.
Look for
Second-by-second or at least high-frequency data capture, robust app or device-based reporting, easy export or display of ODI events.
Avoid
No recording function, or 'memory' limited to last reading only; app-only recorders that don't save full-night data offline.
Your Decision Framework
Focus on your real monitoring needs and sleep patterns to avoid buying a device that's either too basic or unnecessarily complex.
Clarify Your Overnight Monitoring Goals
Define whether you need continuous data and alarms for clinical reasons (apnea, COPD), peace of mind, or occasional spot alarms.
- • Do you or your loved one need alerts during sleep, or just want to log data?
- • Are you tracking for wellness, or under direct physician care?
- • Will you need to share reports with healthcare providers?
Prioritize Comfort & Usability
Realistically evaluate how the device will feel overnight—prioritize ease of use and secure fit for your specific sleep habits.
- • Is the sensor comfortable enough for nightly use?
- • Can you wear the device all night without interruption?
- • How easily can you retrieve data upon waking?
Align Features & Budget to Your Needs
Map out must-have features (alarm, data logging, app reporting) and skip excessive extras unless you'll truly use them.
- • Does your budget match your required features?
- • Are there ongoing costs (replacement sensors/batteries)?
- • Can you get reliable alarm/data features at your price target?
Avoid These Common Mistakes
1. Relying on Standard Fingertip Monitors for Overnight Use
• Why problematic: These are prone to falling off or causing finger discomfort, often waking users or missing critical events.
• Better approach: Invest in a wrist-wearable or dedicated overnight oximeter built for longevity and comfort.
2. Overlooking the Importance of Alarm Functionality
• Why problematic: A quiet or static alarm won't wake sleepers or notify caregivers, potentially missing desaturation episodes.
• Better approach: Test alarm volume and sensitivity before relying on the monitor for safety.
3. Neglecting Data Export Options
• Why problematic: Without reliable data export or reporting, you can't easily share trends or event logs with doctors for effective follow-up.
• Better approach: Choose models with easy app syncing and clear reporting, or on-device event logs.
Budget vs Reality: What You Actually Get
Under $50
Reality: Spot-check devices with basic alarms and simple displays. Typically finger-clip style, may include limited app features.
Trade-offs: Not comfortable for overnight or continuous use, alarms may not reliably wake you, limited data logging.
Sweet spot: Value is best when used occasionally or as backup to a main monitor.
$50-$150
Reality: Mid-range models often offer continuous spot/event recording, higher comfort, some wristband options, better alarms, and report-friendly data export.
Trade-offs: Some may require buying separate sensors or extra accessories for full overnight utility; comfort and reliability vary between models.
Sweet spot: Frequent home use with solid features is usually found here—look for models with robust data apps and multi-night battery.
Over $150
Reality: Premium, professional-grade continuous monitors. Expect medical-style sensors, highly adjustable alarms, data-rich report generation, and robust build quality.
Trade-offs: Higher upfront cost, but long-term reliability and peace of mind. Not all users need the advanced features, so consider your use case.
Sweet spot: Best for those with chronic medical needs or requiring in-depth clinician-level reporting.
Pro Tips for Success
1. Before You Buy
Test the monitor's alarm and comfort on a daytime nap to see if it will work for you overnight.
2. First Week of Use
Review your initial data and adjust alarm thresholds—ensure events are captured and the alarm wakes you if intended.
3. Long-term Care
Clean sensors regularly, recharge or replace batteries according to manufacturer instructions, and store devices in included cases.
4. When to Upgrade
Consider replacing your device if it frequently disconnects, battery life drops dramatically, or you experience missed alarms.
Our Top Picks
Based on analysis of 4,000+ verified customer reviews
EMAY SleepO2 Wrist Pulse Oximeter
Strikes the best balance between comfort, accuracy, and data reporting for overnight home monitoring. Comfortable enough for regular nightly use, fully compatible with app-based sleep reporting, and reliable for most users needing overnight alarms.
CMI Health Rechargeable Pulse Oximeter
Ideal for users who need clinical-level accuracy and robust alarms for serious overnight tracking. Worth it for those managing chronic health risks or sharing data with healthcare professionals.
Zacurate 500C Elite Fingertip Oximeter
Provides a solid, reliable alarm for spot-checks and short-term use at a wallet-friendly price. Best for users needing occasional checks with simple alerts but not full-night comfort or data.
Disclosure & Transparency
This article contains affiliate links to Amazon.com. As an Amazon Associate, I earn from qualifying purchases at no additional cost to you. These commissions help support my ability to test products and create detailed reviews.
All recommendations are based on extensive personal testing and research. I only recommend products I genuinely believe in and would use myself. Prices and availability are subject to change.