रात्रिभागौ द्वौ स्वप्नकाला त्रिभागः संवेशनोत्थानिकः ॥ कZ_०२.३१.०७ ॥
rātribhāgau dvau svapna-kālā tribhāgaḥ saṃveśana-utthānikaḥ
夜间的两段用于睡眠;第三段用于安顿入睡与起身(夜间处置/警戒管理)。
It implies planned night supervision—checks, repositioning, readiness to respond to disturbances—rather than leaving valuable assets unattended.