We have talked with Body Media at CES. They have an ingenious monitor that you use to track your vitals. Now, they are showing off a patch you wear on your arm for seven days to find out how you are sweating, and how you are sleeping.
The new patch looks like the side of a shoe. You adhere it to your triceps, then work, sleep, shower, and whatever you do, for the next seven days. When done, download the information into the computer.
This patch will not only monitor your activity levels, it will also monitor the sweat and how you sleep. Of course, that can tell your doctor if you get the right amount of sleep in an evening.