The time 90 minutes prior to sunrise is called Braahmi Muhurtham. This time is good for academics, purohits and the time where in the later hours, the night the last 48 mins. (2 ghadi) is called Braahmi Muhurtham. 'Braahmi' means Saraswathi, the Goddess of intellect. The above specified time is auspicious for gaining and sustaining intelligence and knowledge, owing to which it is called Braahmi Muhurtham. It is during Braahmi muhurtham that Sun god spreads his rays just as a peacock spreading its feathers. He starts spreading his light and energy throughout the world. The light rays from the Galaxies influence the human brain.
The nascent sun spreads thousand arms in the form of rays across the sky, which emit light-blue divine rays. These rays bring to life the cells and the brain. Lord Surya or the sun god is also the god of life. If the man can synchronise his senses with these rays during this hour he will be empowered with unchallengeable energy. This observation was endorsed by sages. This is the time when the life under the sun still remains in deep sleep supported by the tranquil and pleasant environment, the sages and munis spread the power of penance, which comes out in the form of high powered electrical and magnetic charge, for the upliftment of the living creatures on the earth. If one keep awake during these hours, it is possible to benefit from this charge.