Free yoga nidra class with Dale. Yoga nidra has been defined as a state of conscious deep sleep. One appears to be sleeping, but the unconscious mind is functioning at a deeper level: it is sleep with a trace of deep awareness. In yoga nidra, while consciousness of the world is dim and relaxation is deep, there remains an inward lucidity, and experiences may be absorbed to be recalled later. Since yoga nidra involves an effortless relaxation it is often held to be best practised with an experienced yoga teacher who verbally delivers instructions.