Snakes - represents many different things, but usually the 'life-process'. If we think of a person's life from conception to death, we see a flowing, moving event. The snake depicts the force of energy behind that movement and purpose that leads us to both, growth and death... along with the passionate emotions and urges, that drive us so powerfully.
So, in some dreams, the snake represents our sexuality, and vitality, throughout our life. In other dreams, the snake can represent creative, or poisonous, energy of our thoughts and emotions.
In the destructive aspect, the snake represents the temptations, poisonous thoughts, and negative emotions that can destroy us.
In the positive aspect, the snake represents a sharp awareness of the world around you, as well as a renewal of life and opportunities.
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Are you doing, or being tempted to do, something you know is wrong?
Do you feel guilty for doing something?

Hope this gives you some insight, good luck!