Yoga nidra, a Sanskrit term meaning "yogic sleep" is a deep relaxation technique and a form of meditation. Also called "psychic sleep," yoga nidra is a state between sleeping and waking. ... Yoga nidra practice results in deep relaxation and expands the individual's self-awareness.

Meditation is a state of being. Our perception of objective information around us, prevents us from being in that state. Our brain filters a large amount of external information, but the almost continuous inflow of information creates a sort of tsunami effect and we feel restless.