Every time Withings Sleep detects you get out of bed, the time will be logged in a Google Spreadsheet.
If
When I get out of bed
This trigger fires every time your Withings Sleep detects that you get out of bed, within the start and end time parameters that you specify.
Then
Add row to spreadsheet
This action will add a single row to the bottom of the first worksheet of a spreadsheet you specify. Note: a new spreadsheet is created after 2000 rows.
Explore more great ways to automate Google Sheets and Withings Sleep