Ratri

In kannada launguage RATRI means night time'''Ratri, who is often also called Ratridevi is the goddess of night in the Vedas, and the mythology of India and Hinduism. She is sister to Ushas, the Vedic goddess of Dawn.
See more at Wikipedia.org...

[Hindu] The goddess of night, and the sister of Ushas.

Ratri (Sanskrit) Night, the darkness and stillness of the night; one of the four bodies of Brahma. Mystically and philosophically, it has a dual meaning: cosmic night as pure spirit which preceded day or manvantara, signifies pralaya and is highly spiritual. In the other meaning night signifies the darkness of relatively perfect matter, unenlightened by the rays from spirit. To this last meaning is ascribed the ancient Hindu statement that Brahma assumed his body of Night for the purposes of emanating the hierarchies of the nether world or matter, commonly called collectively the rakshasas. This corresponds to the archaic Tibetan view of the dread mamo-chohans, as presiding not only at the pralayas, but as being the laws of night or absolute matter.