celestial

According to the Puranas, Dakshinayana marks the period 

https://www.google.com/search?q=Dakshinayana

when the Gods and Goddesses 

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are in their celestial sleep.

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Partner

https://www.google.com/search?q=sleep+partner

https://www.google.com/search?q=sleeping+partner

mantras

https://www.google.com/search?q=sleep+mantras