Fitbit for tracking time went to sleep

I am wondering now if I can achieve a similar outcome with the Fitbit integration.
My Fitbit watch tracks sleep, which includes the time went to bed and the time awoken in the data.
Beeminder already currently can get the hours slept as a metric in it’s official integration. How about the time went to bed as a metric?

I would like to use the time went to bed as a metric in order to avoid going to bed at late times.

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