We have said that a Cosmological Cycle or one Brahma Kalpa is 4.32 billion years and the Life Span of Brahma is 311 trillion years. When His Life span is over, another Brahma takes his place. Now this 311 trillion years is nothing but a split second in the Universal Mind !
Poetic Imagery has it that the Lord was asleep in the Sleep of Superconscience ( Yoga Nidra ) when His own Temporal Power or the Power of Time awakened Him from His slumber !
Chathuryuganam cha sahasra mevam
Thvayi prasupthe punar advitheeye
Kalakhya shaktim pradama prasupta
Prabodhayatvam kila Visvanath !
Thy own Power Of Time, awakened Thee from Thy slumber !