To ponder your existence, to over-think. To experience emotions, growth, life, critically; and find another word for everything. A word that better describes how you feel, what you see, and what you think, So that some validating other may understand. So that you are not alone with your echoing thoughts, with your conscious.
Even worse about being intangibly alive and being alone in living is finding yourself in the only place where no other may ever reach you. An ever-changing place, ever chained to your state. Uncontrolled and deep. Unsafe and terrifying. Somewhere you may reach and travel without even moving. A place that knows you better than you know yourself. When you're asleep you understand it all, no further sorrowful questions. It's all sensible and clear, when it is all absurd. In your subconscious, you may be lost but not curious, because you know all the answers, you just forget them in the morning. Part of being human is longing the things we have lost. There's little we want more than to remember what we forgot.