I don't know what specific devices they may have had in mind, but one accessible way to track sleep is with a smartwatch. I use a Huawei Watch 2, and it tracks

I don't know what specific devices they may have had in mind, but one accessible way to track sleep is with a smartwatch. I use a Huawei Watch 2, and it tracks pretty accurately from what I've seen. Other Wear OS devices are probably similar.