Guess you're on the SN3706 and indeed it is very often (nearly) full. But sometimes it can be good as last week when I got an upgrade to row 1; no C pax and a full boat. Status privilege for 2 of us.
Hope they will treat you well for tonight.
SN has currently plenty of planes on the ground at BRU due all these cancellations but rescheduling must be a nightmare. And forecast is for freezing fog tomorrow 04:00 to 08:00 Z ; not an easy start.
All the best.
H.A.