To share data with your partner, go to the menu, My Eight, Manage Bed Sides, and turn "Share Data with Partner" to ON. Make sure your partner does the same. Once both options are activated, you'll be able to view your partner's data using the double arrows symbol in the top right hand corner.
Confused about which side you're on? The top of the app will let you know if it's "Your Side" or "Other Side"
Keep in mind that your partner's data is view only, and you will not be able to edit it for them.