a little bit, especially for us vatas! The power of digestion is stronger during the day, so you ahve a better chance of digesting it completely from morning to early afternoon.
But it once was the fashion to take castor oil at night for many generations, and cod liver oil could do the same thing as the castor oil was meant for - to aid digestion and relieve constipation or sour belly. It used to be that any time someone ate party food or really feasted, they took castor oil after the meal or before bed.
Since I have no constipation issues (yippee!) I take it in the morning, because I do have weak digestion issues.