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The term ‘Nidra’ means sleep (SAT-J.3)<ref>Available from http://namstp.ayush.gov.in/#/sat</ref>. It is a natural physiological process that occurs in all living beings usually during the nights. It is essential for resting the body and mind after the day-long exertion. Sleep (nidra) is equally essential like food (ahara) and following the path of ultimate reality (brahmacharya). These three are three sub-pillars of life. [Cha. Sa. [[Sutra Sthana]] 11/35]
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The term ‘Nidra’ means sleep (SAT-J.3).<ref>Available from http://namstp.ayush.gov.in/#/sat</ref> It is a natural physiological process that occurs in all living beings usually during the nights. It is essential for resting the body and mind after the day-long exertion. Sleep (nidra) is equally essential like food (ahara) and following the path of ultimate reality (brahmacharya). These three are three sub-pillars of life. [Cha. Sa. [[Sutra Sthana]] 11/35]
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==Physiology of sleep==
==Physiology of sleep==
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When the mind and body are tired, [[kapha]] [[dosha]] and inertia (tamas guna) are increased in the body. In this state, the sensory organs are unable to function. This state leads to sleep (nidra). [Cha. Sa. [[ Sutra Sthana]] 21/35] Inertia (tamas) is the prime factor responsible for sleep (nidra). [Su. Sa. [[Sharira Sthana]] 4/34]
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When the mind and body are tired, [[kapha]] [[dosha]] and inertia (tamas guna) are increased in the body. In this state, the sensory organs are unable to function. This state leads to sleep (nidra). [Cha. Sa. [[ Sutra Sthana|Sutra Sthana]] 21/35] Inertia (tamas) is the prime factor responsible for sleep (nidra). [Su. Sa. [[Sharira Sthana]] 4/34]
The interplay of two significant processes regulates the sleep-wake system.<ref>Gillette M, Abbott S. Sleep Research Society. SRS Basics of Sleep Guide. Westchester, IL: Sleep Research Society; 2005. Fundamentals of the circadian system; pp. 131–138.</ref>
The interplay of two significant processes regulates the sleep-wake system.<ref>Gillette M, Abbott S. Sleep Research Society. SRS Basics of Sleep Guide. Westchester, IL: Sleep Research Society; 2005. Fundamentals of the circadian system; pp. 131–138.</ref>