There are many books out there on what symbols mean and many different answers. Dreams are a direct relation to what is happening in your life. You can actually become conscious in your dreams. A good book which touches on that is Absolute Happiness by an Australian called Michael Domenkyo Rowland. I think his website may be www.lifeact.com.au - but don't quote me on it. I would say a spider has something to do with the WEB in your life. Are you stuck in a web or creating one. Only you can really answer the question as only you know whats going on in your life.