Charak Samhita

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रात्रौ जागरणं रूक्षं स्निग्धं प्रस्वपनं दिवा| अरूक्षमनभिष्यन्दि त्वासीनप्रचलायितम् ||५०||

sanskrit

[Qualities of day and night sleep] Insomnia or staying up late at night causes roughness in the body and sleeping during the day causes snigdhata (unctuousness). However, napping in sitting posture does not cause either roughness nor unctuousness.

english translation

rAtrau jAgaraNaM rUkSaM snigdhaM prasvapanaM divA| arUkSamanabhiSyandi tvAsInapracalAyitam ||50||

hk transliteration