Philips DreamStation Data Guide

If you have an original Philips Respironics DreamStation in your bedroom, you already know it quietly records a lot about each night of therapy. What is harder to find out is how to actually see those numbers in plain language, without buying anything, without an account, and without sending your health data to a server you do not control.

CPAP Clarity reads your DreamStation SD card entirely inside your web browser. Nothing is uploaded. This guide explains what the original DreamStation records, where it stores it, how to import it, and how to make sense of the four numbers most owners care about: usage, AHI, pressure, and leak.

A Plain Note on the 2021 Recall First

Before anything else, an honest note. The original Philips Respironics DreamStation was part of a Philips Respironics recall announced in 2021 related to the sound-abatement foam used in certain CPAP, BiPAP, and ventilator devices. The original DreamStation is no longer sold new.

This article is for people who already own one and want to understand the data it records. It is not a recommendation to buy, keep, or replace any device. Those are decisions for you and your clinician, with current information from Philips.

If you have not already registered your device or checked its recall status, the manufacturer maintains an official recall and remediation page. Start there and talk to the clinician who manages your therapy:

Philips Respironics recall and remediation information (official)

CPAP Clarity does not sell devices, does not link to a replacement, and earns nothing from how you act on the recall. We only help you read the data your current machine already wrote.

What the DreamStation Records

The original DreamStation is an auto-adjusting CPAP. The common 500-series version is an Auto CPAP, meaning it raises and lowers your pressure automatically through the night inside a range your prescription allows. Every night it writes a detailed log to its SD card. That log includes:

Usage hours. How long the machine actually delivered therapy each night, which is the number insurers and the Medicare adherence rule care about most.

AHI (Apnea-Hypopnea Index). Events per hour of use, the headline therapy number. The DreamStation breaks the underlying events into categories: obstructive apneas, clear-airway (central) apneas, hypopneas, RERAs (respiratory-effort-related arousals), and flow limitations.

Therapy pressure. Because the 500-series is an Auto CPAP, it records the pressure it chose moment to moment, so you can see your median pressure and your 90th- or 95th-percentile pressure rather than a single fixed number.

Mask leak. How much air escaped around the mask seal, which is the single most common reason therapy numbers drift in the wrong direction.

A flow waveform. A breath-by-breath trace of airflow, which is the raw signal the device uses to count events in the first place.

Reading these together is far more useful than any single number. A low AHI with a high leak, for example, tells a different story than a low AHI with a perfect seal. For the broader framing of what AHI is and is not, see What Is AHI?.

Where the Data Lives on the Card

DreamStation therapy data sits on a removable SD card that slots into the machine. When you open the card on a computer, you will find a folder named P-SERIES at or near the root, along with some supporting files the device uses to identify itself. The detailed nightly logs live inside that P-SERIES structure.

You do not need to understand the folder layout to use it. The important thing is the opposite of what feels natural: do not dig into P-SERIES and hand-pick a single file. CPAP Clarity needs the whole card so it can find the device identity files and all of your nights at once.

If you want a deeper primer on CPAP SD cards in general, including formatting and card choice, see the CPAP SD card guide.

What About the DreamStation 2?

The DreamStation 2 is the newer generation Philips released after the original DreamStation. CPAP Clarity reads it too. If you have a DreamStation 2 (the model number on the bottom label looks like 520X110C, often shown as "DreamStation 2 Auto CPAP Advanced"), the steps below are exactly the same: connect the whole card and import it.

There is one real difference worth knowing about, because it explains why some other tools cannot open a DreamStation 2 card at all. The original DreamStation writes its nightly logs as plain files you could in principle open yourself. The DreamStation 2 instead scrambles its files into an encrypted format on the card. That encryption is the reason a DreamStation 2 card often looks unreadable or empty in tools built for the older model.

CPAP Clarity unlocks the DreamStation 2 format directly inside your browser and reads the same nightly information: your usage, AHI and its components, auto pressure range, and mask leak. As with everything else here, the unlocking and the reading happen on your own device. Nothing about your DreamStation 2 card is uploaded. You still select the whole card, and CPAP Clarity figures out which generation you have on its own.

Step 1: Eject the SD Card Safely

Power the DreamStation off and unplug it from the wall first. If a humidifier chamber is attached, you do not need to remove it to reach the card, but unplugging the machine avoids any chance of a half-written file.

Find the SD card slot on the side of the machine. Press the card in gently and let it spring out, then pull it free. Set the machine back where it lives. You will put the card back when you are done, and the DreamStation will keep recording exactly as before.

Step 2: Connect the Card to Your Computer or Phone

Slide the SD card into the built-in card reader on your laptop, or use an inexpensive USB SD reader if your computer does not have a slot. On a phone, a USB-C or Lightning SD reader works the same way.

iPhone and iPad on iOS 17 or newer can read the whole card folder directly in Safari. Android phones running Chrome handle it the same way. If your first reader or browser does not cooperate, try a different reader or a different browser before assuming the card is the problem.

Step 3: Import It Into CPAP Clarity

Open cpapclarity.com and find the import zone on the home page. Select or drag the entire SD card, not a single file and not just the P-SERIES folder. Selecting the whole card lets CPAP Clarity read the device identity files and every night in one pass.

Everything happens inside your browser. The parsing, the math, and the charts all run on your own device. No night of data is uploaded anywhere. If you want to confirm that for yourself, our CPAP data privacy explainer covers exactly how and why the processing stays local.

When the import finishes, your dashboard loads with your most recent night front and center and a list of every session found on the card.

How to Read Your Numbers

Here is how to make sense of the four numbers most DreamStation owners look at, framed as observations to bring to your provider rather than instructions to act on.

Usage Hours

This is simply how long you wore the mask with therapy running. The common adherence benchmark used by Medicare and many private insurers is at least four hours a night on at least seventy percent of nights across a thirty-day window. More sleep on therapy is generally better than less, but the exact target for you is a clinical question. If your usage hours look short and you are not sure why, comfort issues are usually the cause, and the CPAP machine comparison and our comfort guides can help you reason about what to raise with your provider.

AHI and Its Components

AHI under 5 is the range most clinicians consider well-controlled. AHI from 5 to 15 is often described as mild residual events, and AHI above 15 is worth a specific conversation with the clinician who manages your therapy.

The components matter as much as the total. If most of your events are obstructive apneas and hypopneas, that is the kind of event CPAP is designed to address. If you see a meaningful and persistent share of clear-airway (central) apneas, that is a different pattern, and it is one to flag rather than interpret on your own. The article on central versus obstructive apnea explains why the distinction matters. Flow limitations and RERAs are subtler signals of partly restricted breathing; if you want to understand them, see understanding flow limitation.

Pressure (Auto)

Because the 500-series DreamStation is an Auto CPAP, the most useful pressure number is not a single value but a range and a typical level. CPAP Clarity shows your median pressure and your 90th- or 95th-percentile pressure. If the machine spends most of the night near a steady pressure, your therapy is generally settled. If it is constantly riding the top of its allowed range, that is a sign to discuss the range with your provider.

Never change your prescribed pressure or its limits yourself. Pressure adjustments belong to the clinician who has your full medical context, not to any data tool.

Leak

Leak is the amount of air escaping your mask seal. A small, steady leak is normal and expected, because masks are vented by design. The problem is a large or spiky leak, which can let events slip past uncounted and make every other number less trustworthy. If your leak looks high on the nights your AHI looks worse, that is often the first thread to pull. Our comfort guides on mask fit are a good next stop, and a mask that fits your face and sleep position is usually the fix.

When to Talk to Your Doctor

CPAP Clarity is an informational tool, not a diagnostic one. It helps you see your own data clearly. It does not tell you what is wrong or what to change. Bring your numbers to the clinician who manages your therapy if you notice patterns like these across several nights, not just one:

AHI consistently above 5 even on nights with solid usage hours.
A rising or persistent share of clear-airway (central) apneas.
Pressure pinned at the top of its allowed range night after night.
Large or spiky mask leak that lines up with your worse nights.
Daytime sleepiness that returns even when the numbers look fine.

And separate from the data entirely: if you have not addressed the 2021 recall status of your specific device, that is a conversation to have with Philips and your clinician using current official information, not something a data tool can answer.

Keeping a Copy of Your Data

Once your data is in the browser, it lives in local storage on that device. If you switch computers, clear your browser, or just want a safety copy, you can export a backup file and re-import it later. The backup your CPAP data guide walks through it. For a second opinion on the raw numbers, the free desktop program OSCAR reads DreamStation cards too and is a reasonable cross-check if you ever want to confirm a figure.

Frequently Asked Questions

Can I read my Philips DreamStation data for free?

Yes. CPAP Clarity reads the original DreamStation SD card for free, with no account and no upload. The parsing runs inside your web browser on your own device, so your therapy data never leaves your computer or phone.

Which folder on the SD card holds the DreamStation data?

Nightly therapy logs live in a folder named P-SERIES on the card, along with supporting files the device uses to identify itself. You do not need to open it. Import the entire SD card so CPAP Clarity can find both the device identity files and every night at once.

What does my DreamStation actually record each night?

The original DreamStation records your usage hours, your AHI broken into obstructive apneas, clear-airway (central) apneas, hypopneas, RERAs, and flow limitations, the auto-adjusting therapy pressure it chose, your mask leak, and a breath-by-breath flow waveform.

Is the original DreamStation still sold?

No. The original Philips Respironics DreamStation was part of a Philips Respironics recall announced in 2021 related to its sound-abatement foam and is no longer sold new. This guide is for current owners who want to read their existing data. For recall and remediation details, use Philips' official recall page and talk to your clinician.

Does CPAP Clarity read the DreamStation 2?

Yes. CPAP Clarity reads both the original DreamStation and the newer DreamStation 2. The DreamStation 2 stores its data in an encrypted format that many tools cannot open, which is why a DreamStation 2 card can look unreadable elsewhere. CPAP Clarity unlocks that format inside your browser and shows the same numbers (usage, AHI, pressure, and leak). You import it the exact same way: select the whole card and let the app detect which generation you have.

Do I need the internet to read my data?

You need to load the CPAP Clarity page once. After that, the import, the calculations, and the charts all run locally in your browser. Your night-by-night data is never uploaded to a server.

Can I change my pressure based on what I see?

No. CPAP Clarity shows you what your machine recorded so you can have a better-informed conversation, but pressure and other prescription settings should only be changed by the clinician who manages your therapy and has your full medical context.

Get Started

Drop your DreamStation SD card onto the CPAP Clarity home page to see your first dashboard. No account, no upload, no data leaves your browser. If something in your numbers does not look right, the feedback page reaches a real person.

Further reading: