Not-falling position, bu-dao dan in Chinese transliteration, is a method of
practice. Practitioners neither lie down nor go to bed at night but, when
others retire to rest, assume the lotus position to retain the dharani,
repeat the Buddha' s name, invoke the Buddhas and bodhisattvas, and
enter into meditation. They cut down sleep hours to forge ahead in
cultivation; they are expediting attainment of wisdom in samadhi. Such
is the not-falling position in practice.