It’s sort of like having your watch tell you whether you slept well or not. Didn’t you already know? If you think you slept well and your watch disagrees, are you going to trust its opinion over your own?
Also, I don't think most people are in a position where they feel like they have amazing sleep every night. Yeah, maybe those people have nothing to gain from gadgets kind of like a person at ideal weight doesn't gain anything from counting calories: but what about the rest of us?
My wrist device was critical in helping me realize how few hours I was sleeping despite being in bed with my eyes closed for 8 hours.
These apps can detect that you are moving around a lot and also detect that you are snoring (another sign of sleep apnea).
Even if you know that you snore without using a sleeping app, that doesn't really give you a picture of how bad it could be. I apparently stop breathing and sometimes start choking in my sleep.
Now that I have a diagnosis of sleep apnea sleep apps are still really helpful. If I'm still snoring, it means I probably need to adjust the pressure on my CPAP machine. If the app for my CPAP machine tells me that I'm having a lot of episodes over the course of the night, I might need to adjust the pressure or the fit of the mask.
sleep apps have probably literally saved lives.
1. The heart rate line graph during my sleep made me realize just how bad exercise within 6 hours of bed is. My resting heart rate is 43bpm, yet if I exercise, I'll try to sleep at 60bpm that slowly decreases to 45bpm over 4-6 hours. And it always coincides with worse sleep.
2. I realized how often my HR jumps during sleep. Turns out I have a deviated septum that got bad enough in my 30s to regularly block breathing. I thought I had sleep apnea that would require a CPAP but it turns out I just need nasal strips. No more problems.
3. If you see you have bad sleep, you can now ask the question "how do I improve my sleep?" If you don't know you have bad sleep because you think you're sleeping 8 hours, then you don't realize you have levers to pull.