Since the update that changed the UI (which I hate, I might add) my sleep history is displaying in time zones that are not reflective of the settings I have established in the device. I've gone in and checked the updates, it is current and the settings are accurate, so I am unable to change this so it is accurate. Overall changing time zones has been problematic as well. Please fix this mess!
I will add that the new UI is awful, difficult to read and not meaningful at all. I have been a long time Fitbit user and I have to say that it no longer feels like a quality product and I'll be looking elsewhere for my next smartwatch.
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