The rationale can be applied to many practices, that is, absent the attainment of realization, some practices are just beyond one’s capability, such as the bardo practice. To someone who has gained realization, even normal activities like eating and sleeping can become a form of practice; it is actually much easier to enter samadhi during sleep and to advance the practice at a faster pace. But undertaking the more advanced practices before attaining realization is at best a mere formality. It is therefore imperative to strive to attain realization of emptiness as soon as possible.
~ Depicted from "THE HANDBOOK FOR LIFE"S JOURNEY : On The Three Poisons - How to Confront Anger