The first six types of consciousness are the sensory perceptions: ...eye, ear, nose, tongue, body, and mind consciousness. The seventh type of consciousness, nuisance mind, is a kind of conglomeration called nyon-yi.
The idea of resting one's mind in the basic alaya is to free oneself from that sevenfold mind and rest in simplicity and in clear and nondiscrimination mind. You begin to feel that sight, smell, sound, and everything else is just a production of home ground, or headquarters. you recognize them and then come back to headquarters, where those productions begin to manifest. You just rest in the needlessness of those productions.
The whole logic to process is based on taking it for granted that you trust yourself already, to begin with. You have some kind of relaxation with yourself. This is the idea of ultimate Bodhicitta. You don't have to run away from yourself all the time in order to get something outside. you can just come home and relax. The idea is to return to home-sweet-home.
From Training the Mind & Cultivating Loving-Kindness by Chogyam Trungpa , copyright 1993 by Diana Mukpo.
(Official Chogyam Trungpa Website)
Published by arrangement with Shambhala Publications, Inc., Boston.
This site provides an on-line database of commentaries on the Tibetan Buddhist meditation practices of lojong (Mind Training) and tonglen.