Knight Monitor — CPAP Data
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Sleep therapy data
Read your own CPAP data,
on your own machine.
Your AirSense 11 writes every night to its SD card. This reads that card directly — producing the same therapy statistics your clinic sees, in a report you can hand to your doctor.
Runs entirely offline
Nothing is uploaded
No account, no cloud
Monthly report
Drop STR.edf here, or click to choose
Adherence, AHI with best and worst nights, severity bands, pressure, EPAP and leak — compared against the month before, and exportable as a PDF for your clinician.
optionally add Identification.json for the device name · a .zip of the card also works
Occasionally want to see a single night's breathing traces?
— slower to load, and rarely needed.
Just want to see what the report looks like?
— random, fictional therapy data; nothing is saved.
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At a glance
Overview
What do these numbers mean?
Compliance — adherence is summarised here as the average use per day: total hours used divided by the number of days in the period (unused days count as zero), against a 4-hour goal. The per-night view is also shown: a night counts as compliant when the machine is used for 4 hours or more, as a share of nights used and of all calendar days.
Event indexes (per hour of use) — the AHI broken into its parts. OAI counts obstructive apneas, where the airway physically collapses — the type CPAP treats. HI counts hypopneas, partial airflow reductions. CAI counts central (clear-airway) apneas, where the airway is open but the breathing effort itself pauses — pressure does not fix these, so a rising CAI is worth mentioning to a clinician. UAI is apneas the machine could not classify either way.
RERA Index (RIN) — ResMed's machine-scored count of respiratory effort–related arousals: episodes of increasingly laboured breathing that end in a brief awakening without qualifying as an apnea or hypopnea. Being flow-based only, it is a rough estimate.
Cheyne-Stokes (CSR) — the percentage of the night showing a waxing-and-waning breathing pattern. Occasional low values are common; persistent values are something to raise with a clinician.
Pressure (median / 95th percentile / max) — the air pressure the machine delivered, in cmH₂O. The median is the typical pressure for half the night; the 95th percentile is the level it stayed at or below for 95% of the night, a good guide to how hard it had to work; max is the single highest point. If the median sits at your minimum setting all night, the machine rarely needed to increase pressure.
EPAP — the expiratory pressure: what the machine drops to while you breathe out (pressure relief for comfort). Mask pressure is the same thing measured at the mask rather than commanded by the machine.
Leak, 95th percentile — unintentional air escaping around the mask seal or through an open mouth, in litres per minute, excluding the mask's designed vent flow. The 95th-percentile figure ignores brief spikes (turning over, adjusting the mask). Roughly speaking, values staying under about 24 L/min mean the seal is good and the AHI figures can be trusted; sustained high leak makes the machine both less effective and less accurate.
AHI severity
AASM adult thresholdsWhat does AHI measure?
AHI = Apnea–Hypopnea Index — the number of breathing events per hour of sleep.
An apnea is a near-total blockage of airflow (a drop of ≥90%) lasting at least 10 seconds;
a hypopnea is a partial reduction (≥30%) lasting at least 10 seconds. The machine counts
every event across the night and divides by hours of use, so AHI is a rate: an AHI of 7.7 over a 7½-hour
night means roughly 58 events in total. On CPAP, the goal is a treated AHI below 5; higher numbers mean more
disturbed breathing. Note that the machine estimates events from airflow alone (it cannot see blood oxygen or
brain activity), so single-night values are approximate — the 30-night trend is the more meaningful figure.
Humidification & device settings
as recorded each nightTrends — monthly averages
AVERAGE AHI / MONTH — band shows lowest to highest night
AVERAGE USE PER DAY (HOURS) / MONTH — TOTAL HOURS ÷ DAYS