I came across a new article sharing about the sleep stages in terms of light sleep, REM, etc but in my Fitbit app, I can only see the old stages i.e restless, awake, etc.. I have updated the latest iOS app but I still don't have it.
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Do you have a Charge 2? If so, the sleep stages are still being rolled and should appear on your app soon.
They should be available if you have the Blaze or Alta HR but the other fitbit models do not get sleep stages.
There's more information on sleep stages in this help file: https://help.fitbit.com/articles/en_US/Help_article/2163/
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