Fisher & Paykel SleepStyle: InfoUSB Data and OSCAR Caveats

Fisher & Paykel is a familiar name in CPAP humidification and masks, but its SleepStyle line of flow generators is less talked about than ResMed or Philips machines — and its data lives in a place that surprises a lot of new users. Instead of the SD card most CPAP brands rely on, the SleepStyle stores therapy data on a small removable USB stick. That single design choice changes how you get your numbers out, what software can read them, and one subtle accuracy quirk worth understanding before you put too much weight on a single chart.

This guide is ecosystem education for SleepStyle owners. It is part of our CPAP Machines & Devices hub, where we explain how each brand records and exposes therapy data.

The SleepStyle and SleepStyle+ Auto

The SleepStyle family is Fisher & Paykel's home CPAP/APAP platform, built around the company's signature humidification. There are two data-relevant variants to know:

• SleepStyle — the base machine. It records therapy data locally and hands it off via a removable USB stick (more on that below).
• SleepStyle+ Auto — adds Bluetooth connectivity, which pairs with the SleepStyle App so you can see a daily summary on your phone without physically moving a USB stick.

In CPAP terms, "Auto" refers to APAP (auto-adjusting positive airway pressure), where the machine ranges between a minimum and maximum pressure and responds to events through the night, versus fixed-pressure CPAP. If you are unsure which mode you are prescribed and what each one records, our explainer on APAP vs CPAP vs BiPAP breaks down the differences and the data each produces.

The key takeaway: Bluetooth on the SleepStyle+ Auto is a convenience layer for the phone app. It does not replace the detailed, file-level data — that still flows through the USB stick and the clinical software.

InfoUSB — data on a USB stick, not an SD card

Most CPAP brands write detailed therapy data to a microSD or full-size SD card. Fisher & Paykel does it differently: the SleepStyle uses an InfoUSB stick — a small USB flash drive that plugs into the side of the machine and stores your night-by-night records.

This matters for a few practical reasons:

1. Don't go hunting for an SD slot. If you came from a ResMed AirSense or a Philips DreamStation, you may instinctively look for a card door. On the SleepStyle, the data device is the USB stick instead. (For the SD-card brands, our walkthrough on how to download CPAP data from your SD card covers that side of the ecosystem.)
2. It's removable, so keep it seated. Detailed data is only logged when the InfoUSB is inserted. If it falls out or is left in a computer, the machine may not be recording the granular records your clinician relies on.
3. It carries the data your provider reads. When a sleep clinic or DME (durable medical equipment) supplier asks for your SleepStyle data, the InfoUSB is typically what they read.

The InfoUSB approach keeps the machine simple, but it does mean your "real" data set is tied to a physical stick — so treat it the way you would treat any small, easy-to-lose drive that holds health information.

The SleepStyle App and InfoSmart clinical software

Fisher & Paykel splits its software into a consumer view and a clinical view, and it helps to know which is which.

The SleepStyle App is the patient-facing snapshot — handy for a quick "did I use it and how did last night look" check, but, like most manufacturer phone apps, it is a summary rather than a deep analysis tool. (For a sense of how thin these consumer apps can be, see our breakdown of myAir & DreamMapper limitations — different brands, same general lesson: the friendly score hides a lot.)

InfoSmart / InfoSmart Web is Fisher & Paykel's clinical reader. It is what a sleep clinic uses to pull the full picture off the InfoUSB. As a patient you typically won't be living in InfoSmart day to day, but it's the authoritative F&P-native path to the complete record.

A recurring theme worth internalizing here: a single night's numbers are noise. Whether you're glancing at the SleepStyle App or reviewing a full InfoSmart export, trends over weeks tell the real story — a one-off high-AHI night after a head cold or a glass of wine is not the same as a steady upward drift. Our plain-English guide on how to read CPAP data shows how to read AHI, leak rate, and pressure as a trend rather than a verdict.

An OSCAR accuracy caveat (derived event durations)

OSCAR — the free, open-source desktop CPAP analyzer — does support Fisher & Paykel SleepStyle data, which is good news if you want a deeper look than the SleepStyle App offers. But there's an important caveat that SleepStyle owners should understand before treating every OSCAR number as gospel.

Some CPAP machines record event details directly — for instance, exactly how long each apnea lasted. The SleepStyle doesn't record some of these metrics natively, so OSCAR derives them. In particular, OSCAR estimates certain event durations from the flow rate graph (the breath-by-breath airflow waveform) rather than reading them straight from the device's own logs.

What this means in practice:

• The events themselves are real, but some of their durations are reconstructed by OSCAR's analysis of the airflow signal, not reported by the machine.
• Cross-brand comparisons can be apples-to-oranges. A SleepStyle "event duration" in OSCAR is computed differently than, say, a ResMed value the machine logged itself. Don't read deep significance into small duration differences across brands.
• The flow waveform is where the truth lives. Because the derivation works off airflow, learning to read that signal pays off. Our guide to the CPAP flow rate waveform explains what those breaths actually look like.

A broader point applies to every home device, not just the SleepStyle: machine-reported AHI is an estimate, not a lab-scored result. Devices don't have EEG, so they can't detect arousals or score events the way an in-lab sleep study does under AASM rules. (The recommended AASM hypopnea rule, 1A, counts a 3% oxygen desaturation or an arousal; the older CMS-aligned 1B rule requires a 4% desaturation — and your machine can't see arousals at all.) So device AHI will differ from lab AHI by design. If you want the full picture of why your reported numbers move around, why does my AHI change night to night is a useful companion read.

None of this makes SleepStyle data untrustworthy — it just means you should read it knowing how it was produced. The treatment goal for adults on CPAP is generally a residual AHI below 5 events per hour; many clinicians aim lower (for example, under 1–2) when that's comfortably achievable, though targets are individualized with your provider. Use whatever number you're seeing — SleepStyle App, OSCAR, or InfoSmart — as the start of a conversation with your sleep clinician, not as a license to change therapy on your own.

Where SomniCharts fits (data literacy, not import)

To be straightforward: SomniCharts does not currently import Fisher & Paykel SleepStyle data. We read ResMed, Philips Respironics (including the encrypted DreamStation 2), and Löwenstein prisma machines, and turn those uploads into automatic, plain-language analysis. Fisher & Paykel isn't in that import set today, so we won't pretend otherwise.

What we can do for SleepStyle owners is help you understand your numbers regardless of which machine produced them. Our data-literacy library explains AHI, leak, pressure percentiles, flow limitation, and event types in plain English — and those concepts are the same whether your data came off an InfoUSB stick or an SD card.

A few guides that travel well across brands:

• What is a good AHI on CPAP? — how to read residual AHI in context
• CPAP event types decoded — obstructive, central, hypopnea, and RERA
• CPAP leak rate: what's acceptable — why a big leak can quietly under-report your AHI
• OSCAR vs SleepHQ vs SomniCharts — which tool reads which machine, so you can pick the right one for your SleepStyle

If you later switch to a machine we support, our analysis (powered by SomniDoc, our automatic plain-language interpreter) reads your night for you in seconds — no desktop install, no manual event scoring. Until then, think of SomniCharts as your translator for the numbers, even on a brand we don't import.

Frequently asked questions

Does the Fisher & Paykel SleepStyle use an SD card?

No. The SleepStyle stores its therapy data on a removable InfoUSB stick that plugs into the machine, not on an SD card like most ResMed and Philips devices.

Can OSCAR read SleepStyle data?

Yes — OSCAR supports the SleepStyle. Just be aware that because the machine doesn't record some metrics directly, OSCAR derives certain values (such as event durations) from the flow rate graph rather than reading them straight from the device.

What's the difference between the SleepStyle App and InfoSmart?

The SleepStyle App is the patient-facing phone summary (over Bluetooth on the SleepStyle+ Auto). InfoSmart / InfoSmart Web is the clinical software your sleep clinic or DME uses to read the detailed data off the InfoUSB stick.

Does SomniCharts import Fisher & Paykel data?

Not currently. SomniCharts imports ResMed, Philips Respironics (including the DreamStation 2), and Löwenstein prisma data. For SleepStyle owners, our guides still explain your numbers in plain language regardless of machine.