Dream self

A person's "dream self" is another version of themselves that is supposed to awaken whenever the "real self" is asleep. At the start of Homestuck, the only character whose dream self is awake is Jade Harley, and, according to her, this has been the case for many years. All four of the Homestuck Kids have dream selves, it is unknown if anyone else has them, or if they have anything to do with Sburb. In Act 4, Rose and Dave also awakened their dream selves. Though John has yet to notch this achievement, his dream self has been seen floating around in his sleep and coming very close to opening his eyes.

Jade states that the method of awakening one's dream self is to face (often unpleasant) things one has not before, such as John's wall scrawlings. Though this is not directly seen, Rose and Dave managed to awaken their dream selves in the alternate timeline resulting from John's demise due to gallowsCalibrator, and Rose managed to stay awake when she traveled back to the main timeline, going on to help Dave awaken his dream self. Dave was said to be awake all along without being aware of it.

Each of the kids' dream selves sleeps in a tower that houses a dream version of their room. John and Jade's towers are on a moon orbiting Prospit, while Rose and Dave's towers similarly orbit Derse.

Using her dream self, Jade is able to control her Dreambot, which mimics her dream self's actions. Given that the Dreambot was an invention of Jade's grandfather, this may indicate that Grandpa Harley was aware of dream selves.