Napping with Samsung SLEEPsense

I confess, I was a little suspicious when Samsung invited me to take a nap at its IFA booth. Turns out though, it wasn't a strange casting couch experience they had in mind, but a quick test of the new Samsung SLEEPsense, a contactless sleep tracker that, rather than clamping to your wrist, slips under your mattress to monitor you …