That is the ultimate consciousness, knowing that you're unconscious.
There's nothing like a permanent or temporary switching off or extinction of consciousness.
What the ordinary people call "unconscious" simply means a retreat of the surface consciousness into its subliminal or subconscient depths or it could also mean that the waking consciousness has come out of the body during an OBE.
Like energy, consciousness can neither be created nor destroyed.
Consciousness and Energy form a unified field that manifests as a gradation.