I would do it the same color as the walls it will actually make your ceiling feel higher

I think the ceiling should be white (unless the room has very low ceilings like in an attic bedroom where the ceiling color is sometimes done in the same color as the walls).

If you put the same color on the ceiling as the walls, unless you lighten it with white by half it will appear twice as dark as your wall color. I would do white especially if the room faces north.