When changing RHR baseline calculation from entire sleep to REM+ deep sleep, the standardised ranges change by quite a lot. Superior for 'entire sleep' is <41.5bpm which is very low, while superior for 'REM+deep sleep' is <52bpm. Is there any reason why they differ so enormously - is this a bug - as surely <41.5bpm is not realistic (maybe as a singular measurement but as a RHR baseline, less so). When changing the measurement I jump from 49.9 being the middle of good to 50.6 being the higher end of superior. I am 17 (pretty much 18) and male.