This new version is a truly appalling GUI,difficult to read and with features, notably benchmark, not working.
The previous sleep GUI allowed user to see several day's record and thus easily make comparisons. It also had sensible, easily distinguished colours.
For those of us more elderly users it is not uncommon to wake in the night and stay awake for an hour or so. The old GUI showed the second sleep in the same way as the first, and, if it were more than 3 hours, gave the full analysis. The new version doesn't seem to do this.
With such a major change, users should be offered the option to chose to go back to the previous version.
The obvious alternative to this is to get a new, non-Fitbit tracker.