How habitability sustains combat effectiveness

Are there cases where better ergonomics, sleeping arrangements, or crew quarters helped a navy win?

They are difficult to isolate as a single cause, but cleanliness and habitability keep crews healthier, rested, and deployable for longer, which directly supports combat performance.

Royal Navy cleanliness in the age of sail reduced sickness and left more sailors fit for training and action, despite smaller nominal crews than some foreign counterparts. Long deployments also require personal space and somewhere away from a duty station so people can rest. Large fictional spacecraft can justify parks partly through their contribution to life support. Grand Fleet crews commonly lived aboard their ships, while German battleship crews relied more heavily on shore quarters or accommodation ships. German cruisers were equipped for extended service, so the limitation applied especially to battleships. Habitability consequently affected how long the battle fleet could remain operational at sea.