[ghaff]

I had a review copy of a separate sleep monitor band that you slept on top of from a company that I think Apple bought. Basically I thought it was mostly an interesting curiosity and (possibly) a reasonable first diagnostic step if you suspect you have sleep issues.

However, for me, the results looked reasonable most nights and for those nights when I didn't sleep well for whatever reason, I mostly knew that was the case without the device results.