Back when my dreams were longer and more convoluted, I would always type them up and print them before a session so I could bring a copy with me for her to read along while I read them out loud (we do a lot of dream work). I don't do that anymore; in the last couple of months my dreams have changed and are now quite short and pretty straight-forward, so I don't worry about typing them up anymore. Beyond that, I do think about what I want to talk about as I'm going to sleep the night before.