To have been dreaming of a bill means you will receive a demand for payment soon. Perhaps you are already aware of this and you were worried about payment. Often, worries and concerns at the back of the mind are brought forward in a dream.

Art Mater – Dreams of Dreamers & etc
To my Holy Mother of Artists. Content include Dreams, Mental Health & etc.
To have been dreaming of a bill means you will receive a demand for payment soon. Perhaps you are already aware of this and you were worried about payment. Often, worries and concerns at the back of the mind are brought forward in a dream.