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==Etymology and derivation==

==Etymology and derivation==

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The word is derived from the Sanskrit word root “Nidi kutsyaayaam” by adding the suffix “rak”.<ref name=jha>Jha Srujan. Amarkosha online application</ref> It means sleep, sleepiness, sloth, dream, shutting, budding state, dead, dull, drowsiness etc.

The word is derived from the Sanskrit word root “Nidi kutsyaayaam” by adding the suffix “rak”.<ref name=jha >Jha Srujan. Amarkosha online application</ref> It means sleep, sleepiness, sloth, dream, shutting, budding state, dead, dull, drowsiness etc.

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==Synonyms==

==Synonyms==

Shayanam, swapa, swapna/ swapnam, samvesha, tandra, supti,<ref name=jna/>  vaishnavi [Su. Sa. Sharira Sthana 4/33]

Shayanam, swapa, swapna/ swapnam, samvesha, tandra, supti,<ref name=jha/>  vaishnavi [Su. Sa. Sharira Sthana 4/33]

==Physiology of sleep==  

==Physiology of sleep==