By 'turning on the sleep feature', if you mean "begin sleep now", that is not recommended. You should just let fitbit figure out your sleep by itself. "Begin Sleep Now" was just for older models that did have heart rate tracking, which is now used to detect sleep. Older models had to detect sleep just by lack of movement, so needed the "begin sleep now" and "I'm awake" to prevent quiet awake times being detected as sleep. But now with heart rate being used for sleep detection, that is best not used at all, and in fact can prevent sleep stages being detected. The one use I have found for it is for shorter naps that would be too short to normally be detected by fitbit, i.e. less than an hour.
If you were not referring to "begin sleep now", I don't know what you meant by "the sleep feature".
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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