>To more accurately gauge one’s sleep quality, the researchers recommend the use of clinical grade sleep trackers,

Any recommendations for a good sleep tracker?

edit:- already answered https://news.ycombinator.com/item?id=23431549

tl;dr dreem is the best sleep tracker you can buy currently. Review at reedit https://www.reddit.com/r/ouraring/comments/e3l1jl/30_nights_...

You can use the promo code to get a 20% off NOOEONDVV