Blended-winglets ,
It depends. You are allowed to express a preference for more or less nightstops, and this preference is supposed to be taken into account when your roster is written.
Flappless will say it doesn't work, but it does for me, broadly speaking. As a "min nightstopper" I get maybe one a week. Other people opt for "max 3" or "max 4" which indicates they want to be away for 3 or 4 nights in a row.
Chalky