The Four Mantras of Vedanta

Vedanta holds that we do not get into the waker or the dreamer directly. We have to go through the sleeper. The deep sleep is like a corridor between the waking and the dream. In order to go from one state to another, I have to take that off and put this one on. This is what it means in the fifth mantra. Cheto-mukaha literally translates as a door of consciousness.