Agate – Agate is a symbol of strength and protection especially against bad dreams. If you dream about agate it is a positive omen about you having good dreams. If you see an agate in a bad dream, it is probably a symbol of protection. You dream, in this case is probably false and the agate is a symbol of protection against it. Sleeping with an agate under your pillow or at the head of your bed has been a common practice since ancient times. Some cultures believe that the agate will give you vivid dreams and others believed that it would protect you from bad dreams.