Human's one Nimesh is called Maatraa - means whatever time is taken in pronouncing one syllable or to eyelid.
Such 15 Nimesh = 1 Kaashthaa
Such 30 Kaashthaa = 1 Kalaa
Such 15 Kalaa = 1 Naadikaa
2 Naadikaa = 1 Muhoort
30 Muhoort = 1 Day and 1 night
30 Days and nights = 1 Month
12 Months = 1 Year .. the same year is 1 day and night in Dev Lok
360 Years = 1 Divine year
12,000 Divine years = 1 Chaturyug
1,000 Chaturyug = 1 Day of Brahmaa
The same is one Kalp in which 14 Manvantar pass. In the end of this Kalp Brahmaa's Naimittik Pralaya occurs.
Naimittik pralaya
When 1,000 Chaturyug are over, Prithvi deteriorates. There is no rain for 100 years. At that time all weaker living beings die. Then Vishnu tries to merge all living beings in Himself. Thus He makes the Prithvi completely empty by merging all of its water through Soorya's (Sun) seven rays and all of its living beings in Himself. At that time influenced by Bhagavaan and strengthened by that water, Soorya's seven rays become seven Soorya. All seven Soorya continuously burn all Trilok and Prithvi becomes very hard like the back of the tortoise.
Then Shree Hari appears from Shesh Naag's mouth in the form of fire and starts burning Paataal Lok from bottom. That fire reaches Prithvi after burning seven lower Lok (Paataal) and then burns it also; then it proceeds towards Bhuvar Lok and Swarg Lok, and after burning them that fire starts revolving at the same place. Thus after being burned the whole Trilok looks like a red hot disc. At that time the habitation of Bhuvar Lok and Swarg Lok move to Mahar Lok, but they cannot live there because of the intense heat, so they finally move to Jan Lok.
After this Vishnu produces Samvartak named multi-colored and multi-sized clouds form His mouth air and pacifies the fire. Then there is water all around. The clouds cover even those Lok which are above Bhuvar Lok. They rain for more than 100 years. This is what happens in the end of the Kalp.
When water goes beyond Saptarshi (Great Bear), this whole Trilok becomes like huge ocean. The air emerged from Vishnu's mouth and His breath continue to blow up to 100 years. At that time Vishnu drinks all His Vaayu and sleeps with the help of His Maya power Yog Nidra on His Shesh Nag bed. While this Pralaya occurs, sleeping of lord Vishnu is called "Nimitt". Till He is awake, Universe's all activities go on and when He sleeps, the Universe also disappears in Him.
As Brahmaa's day is of 1,000 Chaturyug, in the same way, when he is absorbed in Vishnu, his night also is of the same time period (1,000 Chaturyug). After the night is over, Vishnu awakes and takes Brahmaa's form and creates the Universe again
Kyunki Saas Bhi Kabhi Bahu Thi 2
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