Last verified: April 2026
Nidra — Sleep
Charaka Samhita documents Nidra (sleep) as one of the three pillars of health alongside Ahara (food) and Brahmacharya — and states directly that happiness, suffering, nourishment, wasting, knowledge, ignorance, life, and death all depend on whether sleep is proper or improper. Sleep in classical Ayurveda is not rest — it is an active physiological process of tissue nourishment and repair.
Nidra as one of the three pillars
Charaka Samhita, Sutrasthana 11 documents three Upastambha (supporting pillars) of health: Ahara (food), Nidra (sleep), and Brahmacharya (regulated conduct). These three, properly maintained, support the body's Dhatus, Agni, and Ojas throughout life. Of the three, Nidra is documented as the one most commonly neglected in the classical patient population — and modern epidemiology confirms that sleep deprivation is now one of the most prevalent health risk factors globally.
The classical documentation of Nidra's functions: Charaka Samhita lists the processes that occur during proper sleep — Preenana (nourishment of tissues), Deha Pushti (bodily nourishment), Bala Vriddhi (strength increase), Varna Samrakshanam (complexion maintenance), Dhatu Poshan (tissue feeding), and Prana Rakshanam (preservation of the life force). These correspond closely to what modern sleep science documents as occurring during deep sleep: tissue repair, growth hormone secretion, immune consolidation, and memory consolidation.