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=== Ratrisvabhavprabhava ===
=== Ratrisvabhavprabhava ===
Tamas guna dominance due to darkness is believed to be the natural status of night (Ratri). And due to dominance of tamas sleep is induced. This is the course of natural cycle of sleep. Thus sleep that is induced due to day and night cycle, at night, is included in this category.
Tamas guna dominance due to darkness is believed to be the natural status of night (Ratri). And due to dominance of tamas sleep is induced. This is the course of natural cycle of sleep. Thus sleep that is induced due to day and night cycle, at night, is included in this category.
== Ratrau Jagaranam ==
Jagaranam means to stay awake or not to sleep. Thus, staying awake at night or not to sleep till late night is known as Ratrau jagaranam. The human body is designed anf programmed in such a way that it works in tune with the nature. Thus the biological clock inside human body is set according to day-night cycle in external environment. When its night, the outside environment is dark and cool. It is believed that the darkness is the attribute associated with Tamas or Tamo guna. Thus there is abundance of tamo guna in environment which naturally helps to induce the sleep in humans. An individual sleeps at night due to change in external environment and thus the sleep at night is natural and beneficial. However, if one stays awake at night it is called as Jagaranam. Staying awake late night causes adverse effects. It is said to cause imbalance of doshas and trigger the process of development of various diseases.
== Diwaswap ==
Diwaswap refers to sleep at daytime. According to natural cycle an individual performs various activities in a daytime or when there is sunlight in abundance. Lack of Tamas guna keeps one awake. But when one sleeps at this time it is not in accordance with the natural course of time. Thus Diwaswap is not advisable rather discouraged except in harsh summers and certain medical conditions or age groups.
== Nidra vega : Sleep, The natural urge ==
Nidra is identified as one of the vegas. Vega refers to the natural urge of the body which is felt or generated in order to fulfill the demand of body to correct the imbalance or to reestablish the equilibrium. Forceful induction or suppression of these urges affects health and well-being. Thus forcible induction of sleep known as Nidra udirana and forcible suppression of urge to sleep, known as Nidra vidharana could lead to multiple health issues.
== Nidra karyam ==
Nidra plays important role in controlling the various aspects of health. Even the sustenance of life or disruption can also be related to sleep.
निद्रायत्तं सुखं दुःखं पुष्टिः कार्श्यं बलाबलम्| वृषता क्लीबता ज्ञानमज्ञानं जीवितं न च||३६||
अकालेऽतिप्रसङ्गाच्च न च निद्रा निषेविता| सुखायुषी पराकुर्यात् कालरात्रिरिवापरा||३७|| Cha. Su 21
(TBE)In human beings, happiness and misery, nourishment and emaciation, strength and weakness, fertility and infertility, knowledge and ignorance, and life and death depend upon proper (and improper sleep). Untimely, excessive sleep and sleep deprivation take away both happiness and longevity from a person. Similarly, proper sleep brings about happiness and longevity in human beings just as real knowledge brings about spiritual power in yogis
== Nidra in Deha vritti ==
Ayurveda gives equal importance to sleep as food in maintenance and survival of human being. Like food, Sleep is also nourishing in nature which when not well regulated or disturbed could be the cause of multiple disorders of body as well as mind.
देहवृत्तौ यथाऽऽहारस्तथा स्वप्नः सुखो मतः| Cha su 21/51
[[Category:Ayurveda]]
[[Category:Ayurveda]]