In modern days, Yoga Nidra has become popularized and systemized by Satyananda Saraswati, a disciple of Sivananda Saraswati. In the year 1976, Satyananda Saraswati introduced a system of deep relaxation through guided meditation, which has become popular throughout the world. Thus, while Yoga Nidra has been popularized as a sleep aid today but its origin is spiritually a timeless journey inward, rooted in the profound knowledge of ancient yogic wisdom.