Sit in Easy Pose with the hands in gyan mudra.
Roll the eyes up to the top of the head as though you were looking through the top of the head. Press the tongue up against the roof of the mouth, with a slight pressure.
Mentally repeat the mantra, Ra Ma - sun, moon. Breathe is normally. Imagine you are looking through the top of the head into a deep blue sky where you see both the sun and the moon at the same time.
Continue for 1 – 11 minutes.
Inhale, exhale and relax.
© The Teachings of Yogi Bhajan
Source: The Ten Light Bodies of Consciousness.