Darth Smeg said:
This ain't Star Trek where the crew have their own quarters for sleeping and playing various music instruments. The captain and his officers do, but they are very few in number.
You know that tiny ship called the Enterprise? The one with the bald guy as captain? It still got almost 900 crew aboard and is just 600 meters long. Our ships are 3 times the length, wider and higher as well and much less automated then those are. I say that 20000 people is hardly enough to make them go. If you double the number I still would not blink my eyes in surprise.
http://memory-alpha.org/en/wiki/Sovereign_class