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To charge the Fitbit you place it on the dock with the metal contacts on the back matching the dock contacts. This is also the same station that is needed to sync up the Fitbit to the website.
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.