The sensitive/normal setting is ignored for trackers with heart rate. That was just for older models without heart rate tracking that can only rely on motion for sleep detection. That said, I think that setting is only on the fitbit.com dashboard settings.
I also find sometimes the whole night just does not get recognized. You can try editing your times to bed and getting up, but don't try that too soon after getting up. I find sometimes it registers a couple of hours slept, but just has not synced for a while. A few hours later I see it does include the rest of the night.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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