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An older version of Sigil converted the non-breaking-space character (as opposed to the html entity) to   when opening/importing/saving code. Are you using the latest version of Sigil?
And yes, with in the "Preserve Entities" preferences (as is default I believe), all  s would be converted to s if changes are made in Book View (in all recent Sigil versions), or upon re-opening the epub.
You can either change the Preserve Entities preference from to  , if you want to be able to edit in Book View without them changing. Or you can leave the Preserve Entities preference as it is and remember to not make any changes in Book View (or not to save/close before you're done).
Bottom line is:   won't survive a reopening of the epub no matter what setting you choose (in my experience, anyway). It will either be converted to or it will be converted to a normal space character (when cleaning on opening/save is disabled in preferences).
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