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To track your sleep you need to place the Fitbit in the included wrist band. By contrast, you can see the Jawbone UP is mounted on your wrist at all times and to track sleep you simply press in once on the button.
This image shows the two fitness devices side-by-side. The Fitbit slides on to your clothing, including a bra, pants, shirt, etc.
Here you can see the two approaches to fitness tracking with the Fitbit Ultra inside the Jawbone UP.