Daoist Master Chen Tuan (871-989) was a celebrated sage who lived a secluded life in mountain caves in China, where he created kung fu and a profound practice of conscious dream travel. He was an ardent student of I Ching. He reputedly wandered the country in disguise, and sometimes provided warnings of impending events such as the flooding of the Yellow River. He was said to travel beyond his body for months at a time. A young monk who found him awake on Huashan, his western mountain sacred to the Goddess, received the following instruction:
I practice the sleep of the perfected
Store up the breath of gold and drink the juice of jade
I lock the golden gate within, so it cannot be opened,
I close the door of earth within, so it cannot be broken.
The green dragon guards the Eastern Palace,
Perfected energy circles in my Pond of Cinnabar
The white tiger stands before the Western Hall.
And spirit water revolves around my five inner orbs.
I call the gods of Jia and Ding to adjust the time;
I summon all the hundred spirits to guard the inner chamber.
Then my spirit
leaves to ascend to the Nine Palaces above
Frolics in the sky's azureness
With it, I step on emptiness as if on solid ground,
Rise up as easy as if falling down.
I inhale the flowery essence of the sun and moon
I sport in the wondrous landscape of vapors and of haze
I visit the perfected and discuss the principles beyond
I join immortals and we go off to visit strange worlds.
Delighted I wish to return
My feet step on clear wind
My body floats on rays of light -
This is perfected sleep!
Master Chen has taken elaborate precautions to ward his body while his spirit travels, but his practice did not always involve special postures. In this account, "he slept while lying flat on his back." He did not appear to be breathing, but his face was rosy and healthy-looking.
They sport with the immortals.
The perfected never sleep
They float up through the clouds.
With our attenuated understanding of what dreaming can be, we must not misunderstand this. Master Chen makes it clear that "great dreams" are the heart of the practice:
Great dreams have great awakening
Small dreams have only small.
Sleep the sleep of all that is perfection
Dream the dreams of wide eternity.
This posture is not unique to Daoists; it has been widely adopted and recommended in many dreaming traditions, sometimes as an ideal posture for entering death. The Buddha, at the moment of death, is always depicted in Asian art as lying in the posture of the sleeping tiger.

