It turns reddish gradually, so I don't really notice it. If I disable it at night, the sudden blueness hurts for a second, which implies there's some benefit to being redder.
In some WWII submarines, the sleeping room lined with bunks for the bulk of the staff, the lighting is red. Why? Because you can sleep in it easily -- it's always just red in that room because there are some day and night shifts even on a sub.