Comment by TheRealHB

Yes, it could be the placebo effect, but placebo works wonders ; )

I detailed better aspects on a question above,

Mostly when I added the heart monitor, somehow I can measure that the time to lowest blink got shorter and I'm not paying attention to the device at all.

When I realise it us OFF I can see the logs and see how long it take vs the heartbeat to sync.

Also, I build myself so I like there was no marketing or product to trust, just test and adjust.