 So dream incubation isn't foolproof. It won't work every time. But it could be worth a try. Here's how you do it. Just before you fall asleep, you're going to tell yourself, I want to dream about X. And just have a simple phrase or at most a sentence about your question or problem or topic. Tell yourself verbally you want to dream about it. And then find an image that really embodies it. Could be a mental image or maybe you look at a physical photo or an object.