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Publish at February 04 2026 Updated February 05 2026

Sleep: the most reliable indicator is not in your phone

Why are we so obsessed with optimizing our sleep?

A smart watch on your wrist

Health-related technologies are becoming increasingly widespread: it's now possible to count your steps, calories and sleep time. Connected watches, rings and applications enable more and more people to monitor their rest and biological parameters. As soon as you wake up, you can check how long you've slept, whether you've woken up, snored, stopped breathing, spoken words and so on. For many people, online devices enable them to manage their sleep from A to Z.

But is this a fair approach? Can we really rely on these devices and apps to record sleep-related medical issues? It's complicated....

While these devices can indicate certain facts, the monitoring work has nothing to do with sleep tests carried out in specialized clinics. Indeed, a wristwatch will underestimate certain elements or overestimate others, giving a not entirely accurate reading of the last night recorded. What's more, some people find themselves obsessed by the figures the apps give them, going to consult and discovering, for example, that they only had 12% deep sleep when they should have had 15.

Yet the question is simple: do people feel rested after their night? Do they feel functional, or do they start dozing off at odd moments? It's these indicators, more than apps and connected objects, that can point to a pathology or a real rest problem.

Length: 9min05

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Image: Carlos Zuniga from Pixabay

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