The Buddhist explanation of Nidra yoga

The tantric buddhist considers nidra yoga as a path to enlightenment.Here are the words of Tenzin Wangyal Rinpoche
From the book ‘the tibetian yogas of dream and sleep’

“All of us dream whether we remember dreaming or not. We dream as infants and continue dreaming until we die. Every night we enter an unknown world. We may seem to be our ordinary selves or someone completely different. We meet people whom we know or don’t know, who are living or dead. We fly, encounter non-human beings, have blissful experiences, laugh, weep, and are terrified, exalted, or transformed. Yet we generally pay these extraordinary experiences little attention. Many Westerners who approach the teachings do so with ideas about dream based in psychological theory; subsequently, when they become more interested in using dream in their spiritual life, they usually focus on the content and meaning of dreams. Rarely is the nature of dreaming itself investigated. When it is, the investigation leads to the mysterious processes that underlie the whole of our existence, not only our dreaming life.
The first step in dream practice is quite simple: one must recognize the great potential that dream holds for the spiritual journey. Normally the dream is thought to be “unreal,” as opposed to “real” waking life. But there is nothing more real than dream. This statement only makes sense once it is understood that normal waking life is as unreal as dream, and in exactly the same way. Then it can be under-stood that dream yoga applies to all experience, to the dreams of the day as well as the dreams of the night”