It might be possible to get that indirectly through cognitive tests taken throughout a person's life and see how they progress Sleep quality deteriorates rapid

It might be possible to get that indirectly through cognitive tests taken throughout a person's life and see how they progress Sleep quality deteriorates rapidly after age 45, at least from what I was told by the Dreem2 tech support a while ago. My understanding is this involves the amplitude of brain waves during primarily the N3 stage, while physical exercise has been shown to enhance that amplitude, e.g. walking 3 miles a day The Dreem2 headband does have the ability to enhance the amplitude and duration of N3 brain waves also, by using timed pulses of pink noise in a feedback loop Though I don't think that feature was available to consumers inside the USA cuz of FDA regulation BS