निद्रा
Nidrā
nid-RAA (short 'i', retroflex 'd', long final 'aa')
Level 2Etymology
Root: From the prefix ni- (down, inward) + √drā (to sleep, to flow); feminine noun of the ā-stem declension, literally 'that state into which one sinks'
Literal meaning: Sleep; the state of sinking inward or flowing downward into unconsciousness
Definition
Nidrā is the natural physiological state of sleep in which sensory activity and voluntary movement are suspended. In daily life, it refers to the essential cycle of rest that restores the body and mind. Ayurveda considers proper nidrā one of the three pillars (upastambha) of health alongside food and regulated conduct.
In Patanjali's Yoga Sutras (1.10), nidrā is classified as one of the five vṛttis (mental modifications) — a tamas-dominant wave in consciousness characterized by the absence of waking content. Yoga Nidrā, the practice of conscious sleep, transforms this ordinary vṛtti into a powerful meditative tool where awareness remains while the body and mind enter deep rest.
At the transcendent level, nidrā symbolizes the cosmic veil of avidyā (ignorance) that conceals the Self. Viṣṇu's Yoganidrā on the cosmic ocean represents the universe in a state of pralaya — dissolution between creation cycles. The Devī Māhātmya personifies Yoganidrā as Mahāmāyā herself, the supreme power that both obscures and reveals Brahman, reminding us that even cosmic sleep is sustained by consciousness.
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Common Misconception
Many assume nidrā is simply a blank void or absence of mind. Patanjali specifically identifies it as an active vṛtti — a definite mental modification supported by the cognition of absence (abhāva-pratyaya). Deep sleep is not 'nothing happening' but a tāmasic wave of consciousness, which is why upon waking one can report 'I slept well' or 'I slept poorly' — a witness was present throughout.
Modern Application
Understanding nidrā transforms how we approach rest in a productivity-obsessed culture. Rather than viewing sleep as wasted time, the yogic framework reveals it as an active mental state that can be refined. The modern Yoga Nidrā practice — now validated by neuroscience for reducing cortisol, anxiety, and PTSD symptoms — applies this ancient insight therapeutically. Recognizing sleep as a vṛtti also encourages mindful sleep hygiene: managing screen exposure, maintaining regular rhythms, and cultivating sāttvic evening routines. When we honor nidrā as a pillar of health rather than an obstacle to achievement, both our waking clarity and spiritual practice deepen.
Related Terms
Quick Quiz
In Patanjali's Yoga Sutras, nidrā (sleep) is classified as one of the: