Six Lokas refers to a Bönpo and Nyingmapa spiritual practice or discipline that works with chakras and the six loka that is dimensions or planes as well as the six classes of sentient beings in the Bhavachakra. Various traditions of the sadhana also include mindstream elements.
Tenzin Wangyal Rinpoche and Chögyal Namkai Norbu Rinpoche have published literature and teach versions of the sadhana or practice. For both of these versions the six lokas are cognate with the principal six chakra system of Vajrayana.
Tenzin Wangyal Rinpoche states that:
Traditionally the Six Lokas practice has been explained in terms of the purification of beings in other realms of existence, but Western practitioners may find it more useful to experience each of the lokas within themselves. Emotions are far more familiar and have a greater impact than the descriptions of realms outside the experience of most Westerners. At various times in life through your emotions you manifest the attributes of beings in each of the six realms and experience the same suffering that they feel. 
The Six Lokas can be divided into six realms:
- Devas, or the realm of gods (see Deva_(Hinduism))
- Asuras, or the realm of deities or demigods
- The realm of men
- Pretas, or the realm of ghosts
- The realm of brutes
- Naraka, or the realm of hells and purgatories
- Wangyal, Tenzin. Six Lokas. (Edited by John Jackson. Source: (Accessed: April 30, 2007 )
- Tenzin Wangyal Rinpoche (2002). Healing with Form, Energy, and Light. Ithaca, New York: Snow Lion Publications. ISBN 1559391766
- Kamath, M.V. (1993). Philosophy of Life and Death. Jaico Publishing House. ISBN 8172241755,9788172241759
- Fay Ellwood, Gracia (2001). The Uttermost Deep: The Challenge of Near-Death Experiences. Lantern Books. ISBN 1930051271, 9781930051270