Like ca1um132 said, one of the main reasons to keep a DJ is to help you find dreamsigns. More importantly, 20 dreams recorded is like saying you have 1/9000th of a penny and are saving up for a million dollars. Keeping a DJ consistently will make you more familiar with your dreams, their elements, how you feel during them, what they look like, what your thought processes are, and what your dreamsigns are on top of all of that. Your recall will also improve, leading you to remember more and more dreams every night. And making you less likely to forget your lucid dreams.