1. The researcher is also an entrepreneur whose product's sales depend on people thinking Fitbit isn't good enough. https://sonicsleepcoach.com/about-dr-dan/ 2. The quote lumps Fitbit and Apple Watch together in terms of how frequently heart rate is measured, when there's a 60x difference. A sincere quote would be more along the lines of "Apple Watch's 1-5 minute sample rate certainly isn't enough, but even Fitbit's 1-5 second sample rate won't give the accuracy you need..." 3. He doesn't say what's wrong with any published study showing sleep stage accuracy of Fitbit, notably https://academic.oup.com/sleep/article/40/suppl_1/A26/378095...
I haven't yet received the newer model, but it seems to solve the issue of limited battery life in the previous model and the ring is also significantly smaller.
I wonder if you considered that maybe I use my bed throughout the day for non-sleep-related activities.
I wonder if you considered that "watching TV" might have been an example, and I don't actually have a TV in my bedroom.
I don't particularly want to remember to put it on every night. I know Nokia launched a mattress pad recently (https://health.nokia.com/gr/en/sleep) but I'm concerned about how reliable this is if I don't sleep exactly on top of it. (Plus I don't know how this could actually tell anything like sleep cycles and what not, or even detect that I'm asleep vs. watching TV in bed)