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    CPAP Flow Limitation: The Hidden Metric Beyond AHI

    Reading Your CPAP Data reading-your-cpap-data library
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    From the SomniCharts Learn library · You can have flow-limited breaths all night with an AHI of 0 and still feel exhausted. Learn what flow limitation is and why most apps never show it. Read the full article → https://www.somnicharts.com/learn/flow-limitation-hidden-metric Related reading: Reading Your CPAP Data, How to Read the CPAP Flow Rate Waveform (Flat-Top Breaths), RERA and Flow Limitation: The Events That Don't Show in Your AHI, UARS (Upper Airway Resistance Syndrome): The Diagnosis Your AHI Misses, Still Tired on CPAP With Good Numbers? Reasons and Next Steps Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    Fisher & Paykel SleepStyle: InfoUSB Data and OSCAR Caveats

    CPAP Machines & Devices cpap-machines-and-devices library
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    From the SomniCharts Learn library · The SleepStyle uses an InfoUSB stick, not an SD card, and OSCAR derives some metrics from the flow graph. Learn how F&P data works. Read the full article → https://www.somnicharts.com/learn/fisher-paykel-sleepstyle-data Related reading: CPAP Machines & Devices, OSCAR vs SleepHQ vs SomniCharts: Which Tool Reads Which Machine, How to Read Your CPAP Data: A Plain-English Guide to AHI, Leak Rate & Pressure, How to Download CPAP Data from Your SD Card (ResMed, Philips, Löwenstein, BMC, Hoffrichter), APAP vs CPAP vs BiPAP: Machine Modes and the Data Each Produces Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    Philips DreamStation 2: Why Its Data Is Encrypted and Your Options

    CPAP Machines & Devices cpap-machines-and-devices library
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    From the SomniCharts Learn library · The DreamStation 2 encrypts its SD-card data, so OSCAR can't read it. Learn why — and which tools can, now that DreamMapper has shut down. Read the full article → https://www.somnicharts.com/learn/dreamstation-2-encrypted-data Related reading: CPAP Machines & Devices, Philips DreamStation 1 & System One: SD Card Data and How to Read It, Philips Respironics Recall, Explained Neutrally — and Your Data, myAir & DreamMapper Limitations: Why Your CPAP App Isn't Enough, Switching CPAP Brands? Keep Your Data History Across Vendors Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    Philips DreamStation 1 & System One: SD Card Data and How to Read It

    CPAP Machines & Devices cpap-machines-and-devices library
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    From the SomniCharts Learn library · Unlike the DreamStation 2, the original DreamStation and System One store unencrypted, readable data. Learn where the SD card is and how to analyze it. Read the full article → https://www.somnicharts.com/learn/dreamstation-1-data-guide Related reading: CPAP Machines & Devices, Philips DreamStation 2: Why Its Data Is Encrypted and Your Options, Philips Respironics Recall, Explained Neutrally — and Your Data, Switching CPAP Brands? Keep Your Data History Across Vendors, How to Download CPAP Data from Your SD Card (ResMed, Philips, Löwenstein, BMC, Hoffrichter) Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    How to Download CPAP Data from Your SD Card (ResMed, Philips, Löwenstein, BMC, Hoffrichter)

    CPAP Machines & Devices cpap-machines-and-devices library
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    From the SomniCharts Learn library · A practical guide to getting data off your CPAP SD card — ResMed, Philips, Löwenstein, BMC, Hoffrichter — and reading it without a desktop install. Read the full article → https://www.somnicharts.com/learn/download-cpap-data-sd-card Related reading: CPAP Machines & Devices, ResMed AirSense 11 Data: What Your SD Card Holds (and myAir Hides), ResMed AirSense 10 Data Guide: SD Card and Card-to-Cloud Explained, Philips DreamStation 1 & System One: SD Card Data and How to Read It, Philips DreamStation 2: Why Its Data Is Encrypted and Your Options Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    How to Read CPAP Usage Hours and What 'Compliant' Really Means

    Troubleshooting & Optimizing CPAP troubleshooting-and-optimizing-cpap library
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    From the SomniCharts Learn library · Usage hours aren't the same as effective therapy. Learn how compliance hours differ from quality therapy and how to read short or fragmented nights. Read the full article → https://www.somnicharts.com/learn/cpap-usage-hours-compliance Related reading: Troubleshooting & Optimizing CPAP, CPAP Compliance Report: How to Get One for Your Doctor or Insurance, Can't Tolerate CPAP? A New-User Adjustment and Claustrophobia Guide, How to Read Your CPAP Data: A Plain-English Guide to AHI, Leak Rate & Pressure, Why Does My AHI Change Night to Night? Normal Variation Explained Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    Is Your CPAP Pressure Too High or Too Low? Signs and the Data

    Troubleshooting & Optimizing CPAP troubleshooting-and-optimizing-cpap library
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    From the SomniCharts Learn library · Too-low pressure means snoring and residual events; too-high means aerophagia and exhale fight. Learn the signs and the data that points to the answer. Read the full article → https://www.somnicharts.com/learn/cpap-pressure-too-high-or-low Related reading: Troubleshooting & Optimizing CPAP, CPAP 95th-Percentile vs Median Pressure: What the Numbers Mean, CPAP Aerophagia: Why Your Stomach Bloats and How to Address It, Why Is My AHI High on CPAP? Causes and How to Find Yours, Can I Adjust My Own CPAP Pressure? What the Data Can (and Can't) Tell You Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    CPAP Nasal Congestion and Stuffy Nose: Causes and Fixes

    Troubleshooting & Optimizing CPAP troubleshooting-and-optimizing-cpap library
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    From the SomniCharts Learn library · A stuffy nose can make CPAP miserable. Learn the causes of CPAP nasal congestion and the humidification, mask, and ENT-backed fixes that help. Read the full article → https://www.somnicharts.com/learn/cpap-nasal-congestion Related reading: Troubleshooting & Optimizing CPAP, CPAP Dry Mouth and Mouth Breathing: How to Stop It Tonight, CPAP Mask Types and Fit: Nasal, Pillow, and Full-Face Compared, CPAP Mask Leaks & Mouth Leak: Causes, the Data Threshold, and Fixes, Can't Tolerate CPAP? A New-User Adjustment and Claustrophobia Guide Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    CPAP Mask Types and Fit: Nasal, Pillow, and Full-Face Compared

    Troubleshooting & Optimizing CPAP troubleshooting-and-optimizing-cpap library
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    From the SomniCharts Learn library · Nasal, nasal pillow, and full-face masks each suit different sleepers and leak patterns. Learn how to choose and how mask choice shows up in your data. Read the full article → https://www.somnicharts.com/learn/cpap-mask-types-fit-guide Related reading: Troubleshooting & Optimizing CPAP, CPAP Mask Leaks & Mouth Leak: Causes, the Data Threshold, and Fixes, CPAP Dry Mouth and Mouth Breathing: How to Stop It Tonight, CPAP Nasal Congestion and Stuffy Nose: Causes and Fixes, Can't Tolerate CPAP? A New-User Adjustment and Claustrophobia Guide Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    📚 CPAP Machines & Devices

    Pinned CPAP Machines & Devices cpap-machines-and-devices library
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    From the SomniCharts Learn library · How each CPAP machine family stores your data — ResMed, Philips, Löwenstein, BMC, Hoffrichter — plus what APAP, BiPAP, and ASV modes do. Read the full article → https://www.somnicharts.com/learn/cpap-machines-and-devices Related reading: APAP vs CPAP vs BiPAP: Machine Modes and the Data Each Produces, ResMed AirSense 11 Data: What Your SD Card Holds (and myAir Hides), ResMed AirSense 10 Data Guide: SD Card and Card-to-Cloud Explained, ResMed AirCurve 10 & 11 (VAuto, ST, ASV): Reading Bilevel Data, ResMed EPR, Ramp & Climate Control: Verify Your Comfort Settings, Philips DreamStation 1 & System One: SD Card Data and How to Read It Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    CPAP Leak Rate: What's Acceptable and How to Fix High Leaks

    Reading Your CPAP Data reading-your-cpap-data library
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    From the SomniCharts Learn library · Learn the 24 L/min acceptable CPAP leak threshold, why ResMed and Philips report leak differently, and how large leaks can quietly skew your AHI. Read the full article → https://www.somnicharts.com/learn/cpap-leak-rate-acceptable Related reading: Reading Your CPAP Data, How to Read Your CPAP Data: A Plain-English Guide to AHI, Leak Rate & Pressure, Mask Off & Large-Leak Events: Why Your CPAP Report Shows Gaps, CPAP Mask Leaks & Mouth Leak: Causes, the Data Threshold, and Fixes, CPAP Dry Mouth and Mouth Breathing: How to Stop It Tonight Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    How to Read the CPAP Flow Rate Waveform (Flat-Top Breaths)

    Reading Your CPAP Data reading-your-cpap-data library
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    From the SomniCharts Learn library · Learn to read the CPAP flow rate waveform: rounded breaths are healthy, flat-topped breaths signal flow limitation. The most revealing CPAP chart. Read the full article → https://www.somnicharts.com/learn/cpap-flow-rate-waveform Related reading: Reading Your CPAP Data, How to Read Your CPAP Data: A Plain-English Guide to AHI, Leak Rate & Pressure, RERA and Flow Limitation: The Events That Don't Show in Your AHI, CPAP Flow Limitation: The Hidden Metric Beyond AHI, CPAP Event Types Decoded: Obstructive, Central, Hypopnea & RERA Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    CPAP Event Types Decoded: Obstructive, Central, Hypopnea & RERA

    Reading Your CPAP Data reading-your-cpap-data library
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    From the SomniCharts Learn library · Your AHI is a blend of different events. Learn obstructive vs central apnea, hypopnea, and RERA — and why the same AHI can mean very different things. Read the full article → https://www.somnicharts.com/learn/cpap-event-types-decoded Related reading: Reading Your CPAP Data, What Is a Good AHI on CPAP? AHI Ranges and Residual AHI Explained, Central vs Obstructive Apnea: What 'Clear Airway' (CA) Events Mean, RERA and Flow Limitation: The Events That Don't Show in Your AHI, AHI vs RDI: Why Two Numbers Measure Your Sleep Apnea Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    CPAP Ramp and EPR Explained: Comfort Settings in Your Data

    Troubleshooting & Optimizing CPAP troubleshooting-and-optimizing-cpap library
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    From the SomniCharts Learn library · Ramp and EPR make CPAP more comfortable — and show up in your pressure data. Learn what they do and how they affect the numbers you see. Read the full article → https://www.somnicharts.com/learn/cpap-epr-ramp-comfort-data Related reading: Troubleshooting & Optimizing CPAP, ResMed EPR, Ramp & Climate Control: Verify Your Comfort Settings, CPAP Aerophagia: Why Your Stomach Bloats and How to Address It, CPAP 95th-Percentile vs Median Pressure: What the Numbers Mean, Is Your CPAP Pressure Too High or Too Low? Signs and the Data Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    CPAP Dry Mouth and Mouth Breathing: How to Stop It Tonight

    Troubleshooting & Optimizing CPAP troubleshooting-and-optimizing-cpap library
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    From the SomniCharts Learn library · CPAP dry mouth is often a sign of mask or mouth leak. Learn the causes, the humidity and chin-strap fixes, and how your leak data connects to it. Read the full article → https://www.somnicharts.com/learn/cpap-dry-mouth Related reading: Troubleshooting & Optimizing CPAP, CPAP Mask Leaks & Mouth Leak: Causes, the Data Threshold, and Fixes, CPAP Leak Rate: What's Acceptable and How to Fix High Leaks, CPAP Nasal Congestion and Stuffy Nose: Causes and Fixes, CPAP Mask Types and Fit: Nasal, Pillow, and Full-Face Compared Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    📚 CPAP Data Tools & Apps

    Pinned CPAP Data Tools & Apps cpap-data-tools-and-apps library
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    From the SomniCharts Learn library · Compare CPAP data tools: OSCAR, SleepHQ, myAir, DreamMapper, and online analyzers — what each one shows, what it hides, and which fits your needs. Read the full article → https://www.somnicharts.com/learn/cpap-data-tools-and-apps Related reading: OSCAR CPAP Software Guide — and the Easier Cloud Alternative, How to Read OSCAR Charts in Plain English (AHI, Leaks, Pressure), SleepyHead Is Gone — What to Use Now to Read Your SD Card, OSCAR Alternatives: Best Web-Based CPAP Analysis Tools (2026), OSCAR vs SleepHQ vs SomniCharts: Which Tool Reads Which Machine, How to Read Your ResMed myAir Score (and What It Hides) Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    CPAP Compliance Report: How to Get One for Your Doctor or Insurance

    CPAP Data Tools & Apps cpap-data-tools-and-apps library
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    From the SomniCharts Learn library · Need a CPAP compliance report for insurance or a DOT exam? Learn the 4-hour rule, the 70%/30-day standard, and how to generate a shareable report. Read the full article → https://www.somnicharts.com/learn/cpap-compliance-report Related reading: CPAP Data Tools & Apps, How to Read CPAP Usage Hours and What 'Compliant' Really Means, Online CPAP Data Analyzer: Upload Your SD Card and Understand Your Night, How to Read Your CPAP Data: A Plain-English Guide to AHI, Leak Rate & Pressure, Can I Adjust My Own CPAP Pressure? What the Data Can (and Can't) Tell You Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    CPAP 95th-Percentile vs Median Pressure: What the Numbers Mean

    Reading Your CPAP Data reading-your-cpap-data library
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    From the SomniCharts Learn library · Understand 95th-percentile (P95) and median CPAP pressure, why ResMed uses 95% and Philips 90%, and what your pressure spread says about your settings. Read the full article → https://www.somnicharts.com/learn/cpap-95th-percentile-pressure Related reading: Reading Your CPAP Data, How to Read Your CPAP Data: A Plain-English Guide to AHI, Leak Rate & Pressure, APAP vs CPAP vs BiPAP: Machine Modes and the Data Each Produces, Is Your CPAP Pressure Too High or Too Low? Signs and the Data, ResMed EPR, Ramp & Climate Control: Verify Your Comfort Settings Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    Cheyne-Stokes Respiration & Periodic Breathing: The Heart Connection

    Understanding Sleep Apnea understanding-sleep-apnea library
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    From the SomniCharts Learn library · Cheyne-Stokes respiration is a central breathing pattern strongly tied to heart failure. Learn what it is, why it matters, and when to see your doctor. Read the full article → https://www.somnicharts.com/learn/cheyne-stokes-heart-failure Related reading: Understanding Sleep Apnea, Periodic Breathing & Cheyne-Stokes on Your CPAP Chart, Central vs Obstructive Apnea: What 'Clear Airway' (CA) Events Mean, Obstructive vs Central vs Mixed Sleep Apnea: The Three Types, Sleep Apnea and Your Heart: Hypertension, AFib, Stroke & Diabetes Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.
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    Can't Tolerate CPAP? A New-User Adjustment and Claustrophobia Guide

    Troubleshooting & Optimizing CPAP troubleshooting-and-optimizing-cpap library
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    From the SomniCharts Learn library · Struggling to adjust to CPAP or feeling claustrophobic? Learn desensitization tips, what alternatives exist, and how to track your progress objectively. Read the full article → https://www.somnicharts.com/learn/cant-tolerate-cpap-adjustment Related reading: Troubleshooting & Optimizing CPAP, CPAP Ramp and EPR Explained: Comfort Settings in Your Data, CPAP Mask Types and Fit: Nasal, Pillow, and Full-Face Compared, CPAP Nasal Congestion and Stuffy Nose: Causes and Fixes, How to Read CPAP Usage Hours and What 'Compliant' Really Means Start the discussion below — questions, experiences, corrections welcome. Nothing here is medical advice.