Compare nights
Most useful questions about sleep are before-and-after questions. Did the wedge pillow help? Was the night after wine really worse? Am I acclimatising? Load two, three or four recordings from a Wellue Checkme O2 and see them on one time axis with every metric in a single table. It runs in your browser, and nothing is uploaded.
Drop two or more Wellue CSV exports here
Everything here runs in your browser. Your recordings are never uploaded, and nothing is kept when you close this tab.
How to read the table
Recordings are ordered by date, left to right. In each row the best value is marked in green, where best is lower for the event indices and the time-under-90% figures, and higher for the oxygen averages. Heart rate has no best: lower is not automatically better, and the interesting thing is usually the spread rather than the mean.
The charts above the table share an elapsed-time axis from the start of each recording, so a dip at 3:10 on one night lines up with 3:10 on the others. That is the right alignment for comparing the shape of a night, but it does mean clock time is not shown: a recording started an hour later still begins at zero.
What counts as a real difference
Less than people hope. Night-to-night variation in ODI is large even with nothing changed: sleeping position, a blocked nose, how much of the night was deep sleep, and how well the sensor sat on the finger all move it by several events an hour. An ODI of 6 against an ODI of 9 is noise. An ODI of 6 against 20 is not, and if it repeats it is worth a doctor’s attention. For anything you are trying to test, the honest comparison is several nights each way, which is what an account and its trend view are for.
Comparisons worth making
- A night on your side against a night on your back. Positional apnea is common, and this is the cheapest way to find it.
- Your first night at altitude against the third or fourth. Rising overnight SpO2 is what acclimatising looks like.
- The night before and the night after starting a nasal strip, a mouth guard, or CPAP.
- A night after alcohol against an ordinary one. The difference is usually larger than people expect.