I like the thought of buying a non-wearable sleep tracker for HRV, so I can just set it and leave it. Then I don’t have to put on a ring or smartwatch before going to sleep.
But is any of them accurate if you are sleeping with a partner in the same bed?
It just needs to be accurate enough so I can see trends in my HRV, so I can see if I’m overtraining or if my month-long experiments make positive changes to my HRV 