Dreams..?

Monkey

To see a monkey in your dream, symbolizes deceit, insight and intuition. Those around you are working to advance their own interest. Alternatively, monkeys indicate an immature attitude, a playful nature and the mischievous side of your personality. 

Also consider the significance of the Three Mystic Monkeys who cover their eyes, ears and mouth to mean that they see no evil, hear no evil and speak no evil.

Darkness

To dream that darkness comes upon you, signifies failure in some work that you are attempting.  Darkness is synonymous with ignorance, the unconscious, evil, death, and fear of the unknown. 

To dream that you are lost in the darkness, denotes feelings of desperation, depression, or insecurity.

To dream that you are groping around in the darkness, indicates that you have insufficient information to make a clear decision. Do your research and do not rush into making choices.

Mice/Mouse

To see mice in your dream, indicates that you are spending too much time dwelling on minor problems and insignificant matters.

To see mice feeding or eating in your dream, suggests that someone is trying to bring down your self-confidence. Someone may be nipping away at your resources.

To see a mouse in your dream, indicates fear, meekness, insignificance and a lack of assertiveness. You are experiencing feelings of inadequacy and fears that you are not measuring up. Alternatively, a mouse symbolizes minor irritations and annoyances. Perhaps you are letting petty problems or insignificant issues eat away at you. 

To dream that a mouse is being chased, suggests that you are not standing up for yourself. You are letting others push you around.