The principle of using trackle is that you wear it while you sleep or rest. That means, trackle is convenient even if you work shifts, because it doesn’t matter for the evaluation what time of day you sleep or rest, it only matters that you sleep. 

In general, a basal body temperature (temperature at complete rest) can be determined when you have slept or rested for four hours. Theoretically, it is possible to have cases where the sleep during different times of day impacts the measured value – but that isn’t necessarily the case with every woman. If this happens, you can enter an interfering factor in the trackle app for that day – that way the value is excluded and does not go into the evaluation.

To consider your individual situation, we recommend consulting an experienced NFP counsellor.

If you don’t know a certified NFP counsellor, we can recommend Adelaide.

Adelaide Dechow


Phone: +49 211 700 98 53 

Address: Rudolf-Breitscheid-Straße 4b, 40595 Düsseldorf 


She was a great help to us with developing trackle, and after more than 20 years as a certified NFP counsellor, she knows al the pitfalls – and is super nice, too :)