Dream Yoga or Milam (Standard Tibetan: rmi-lam or nyilam; Sanskrit: स्वप्नदर्शन, svapnadarśana) — the Yoga of the Dream State — is a suite of advanced tantric sadhana of the entwined Mantrayana lineages of Dzogchen (Nyingmapa, Ngagpa, Mahasiddha, Kagyu and Bönpo). Dream Yoga are tantric processes and techniques within the trance Bardos of Dream and Sleep (Tibetan: mi-lam bardo) and are advanced practices similar to Yoga Nidra. Aspects of Dream Yoga sadhana are subsumed within the practice suite of the Six Yogas of Naropa. In the tradition of the tantra, Dream Yoga method is usually passed on by a qualified teacher to his/her students after necessary initiation. Various Tibetan lamas are unanimous that it is more of a passing of an enlightened experience rather than any textual information.
In a footnote on 'Zhitro' (Tibetan: zhi khro) Namdak & Dixey, et al. (2002: p. 124) identify that the 'dream body' and the 'bardo body' is the 'vision body' (Tibetan: yid lus):
In the bardo one has...the yilu (yid lus), the vision body (yid, consciousness; lus, body). It is the same as the body of dreams, the mind body."