Best sleep tracker?

My sleep sucks, or at least I think it does. I’d like to get some data for it.
I don’t currently own an Apple watch, as I’m not sure I’d have much use for it outside of this…
Any other great options? I know there are tons of review sites, but many seem like they are basing their recommendations on who is paying them for advertising…

Thx!

Yeah, I think you got your answer, go with the medical studies.

I was going to suggest the Auro. I have a fit bit, does okay with when I go to bed and when I wake up. If you veg out to tv before bed, sometimes that gets counted as sleep time. as for deep rem light sleep I have no clue, but I don’t think it does a good job. Does have oxgen variation or whatever. So you can see if it goes low while sleeping. Fitbit also has a snore sensor you can use on your phone.

Personally don’t use the sleep data for anything. even their sleep score doesn’t seem to follow how I feel my sleep was.