Tsongkhapa mentions various meditations to be done before falling asleep. In the first one, one generates a vision of oneself as the deity as well as a vision of one's guru, and prays to the guru to recognize the dream and so forth. Then one visualizes a small red four petaled lotus in the throat chakra, with an Ah or Om in the center. He mentions that in another tradition, it is taught that one meditates on five syllables (OM, AH, NU, TA, RA), with one at the center and the other four around it. One focuses on each of these in succession. The second method is to pray as before, and meditate on a white radiant drop the size of a mustard seed between the eyebrows. Then one performs vase breath seven times and goes to sleep.