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Fitbit suggest there are a few reasons this can happen:
"WHY DON'T I SEE SLEEP STAGES TODAY?
There are a few scenarios where you might see your sleep pattern (which shows your time asleep, restless, and awake) instead of sleep stages:
taken from: https://help.fitbit.com/articles/en_US/Help_article/2163/
Same here. Had it and last night went away. All the things were optimal so yes, battery was ok, app is up to date, band adjusted fine, didn't sleep in a different position etc. very frustrated with charge 2 and sleep stages function. I changed from blaze which worked perfectly to charge 2 for sleeker look but sorry I did. What's the deal with getting it one night and not the next.
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
That's what the help is saying. Tracking sleep is not the issue but there is a problem sometimes showing the new sleep stages. When it can't display the new graph it goes back to the old graph.
Best AnswerI got the same issue here. Updated just now and it rolled back to the old sleep graph interface. It is really hard to read this old graph, not sure the reason behind rolling back. Hope they change it with the next update 😞