I haven't drank guayusa enough to know about that
But almost every time I take a good dose of harmalas I wind up in a really vivid lucid dream during or after the experience, especially if combined with binaural beats. Adding in some changa would help to. The key is to maintain awareness while letting your body relax and brain fall into a deeper state of slower oscillations
<Ringworm>hehehe, it's all fun and games till someone loses an "I"