Higher self, true self, consciousness are the words to describe the ultimate power, or ultimate truth, you. It's not about finding it, for it is ever present, the trick lies in connecting with it. I have done this while awake, it lasts for a few fleeting seconds and it is the most incredible feeling, I wish I could experience it at will all the time (maybe with practice) but maybe that's not how it's supposed to be.
I chose to come here and then make my way back to perfection, back to full 100% consciousness in it's true state, not bound by physical raeality. It's like the body dies and you say "that was great, now I'm back to full, free consciousness, what should I try next" and off you go.
We seem to want a reminder of true self while here in reality so we never forget who we really are, like when you play a video game and can pause it to see that you are sitting in a chair with a controller in your hand. Dreams and attaining that connection while awake are the reminders.