Unless they’re spewing out random garbage (which I doubt they are) they’re good for tracking trends. My overnight RHR is about 55. If I’m starting to get sick,

Unless they’re spewing out random garbage (which I doubt they are) they’re good for tracking trends. My overnight RHR is about 55. If I’m starting to get sick, even before symptoms set in, it raises to about 60. By looking at trends I can tell when I’m about to start feeling bad.