[exceptione]

I understood sleep trackers are useless. Here your doctor can lend you some professional watches you can wear for 2 weeks that cost 700 eur, but those are not sold to the public. Unless things did change in the past 4 years.

And even then, they can not really measure your sleep. If you want to measure sleep, you will need to have wires on your scalp that measure what happens inside your brain.

[apatheticonion]

Studies show that some device (like the Fitbit Charge 6, Apple watch) infer sleep stages with a greater than 80% agreement compared to an ECG sleep study.

--- For primarily younger white males

But still pretty good seeing as they infer this largely from heart rate and movement.