Looks like Fatigue Science makes a device called the READIBAND [1], which is used to track sleeping patterns so you can adjust your schedule accordingly, but right now it is only available to military, sports, and big industrial clients. Sounds pretty interesting, in that sports teams are seeing a real benefit.
Can someone who uses one of these performance monitors weight in? Doesn't have to be the READIBAND, but what about Fitbit Flex [2], Jawbone Up [3], or the Nike Fuelband [4]. Does anyone actually notice a marked difference in alertness throughout the day?