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Nidra (Samskrit: निद्रा) refers to the sleep. Sleep is not merely the state of reversible unconsciousness but, according to Ayurveda, sleep is that state of body, mind, senses and energy where the interaction between [[Purusha (पुरुषः)|purush]] (पुरुषः) and loka (लोकम्) is suspended for some time. This provides rest and relaxation to body, mind and senses which consequently relax, rejuvenate and re-energize the person. Thus, sleep is associated with health and well-being of [[Sharira (शरीरम्)|body]] (शरीरम्), [[Manas (मनः)|mind]] (मनः) and senses ([[Indriyas (इन्द्रियाणि)|इन्द्रियाणि]]). Sleep plays major role in the energy dynamics of the body-mind system of a human being. It is that aspect of life process which helps to restore and preserve energy which which could be then utilized to carry out body tissue repair. Because of this Ayurveda has considered sleep as one of the 3 supports of life and thus has given significant attention to the causes, process, effects and disorders related to the sleep.  

Nidra (Samskrit: निद्रा) refers to the sleep. Sleep is not merely the state of reversible unconsciousness but, according to Ayurveda, sleep is that state of body, mind, senses and energy where the interaction between [[Purusha (पुरुषः)|purush]] (पुरुषः) and loka (लोकम्) is suspended for some time. This provides rest and relaxation to body, mind and senses which consequently relax, rejuvenate and re-energize the person. Thus, sleep is associated with health and well-being of [[Sharira (शरीरम्)|body]] (शरीरम्), [[Manas (मनः)|mind]] (मनः) and senses ([[Indriyas (इन्द्रियाणि)|इन्द्रियाणि]]). Sleep plays major role in the energy dynamics of the body-mind system of a human being. It is that aspect of life process which helps to restore and preserve energy which which could be then utilized to carry out body tissue repair. Because of this Ayurveda has considered sleep as one of the 3 supports of life and thus has given significant attention to the causes, process, effects and disorders related to the sleep.