In a real dark night of the soul, it is always three o'clock in the morning, day after day.
The best thing is to always keep honest people around, because when you have a bunch of yes men around that know that you're making a mistake but let you go on with it, that's when it ruins your mind state as an artist.
I don't know what DVD commentaries are about. I'd like to strangle the person who came up with that concept.