早睡早起 Early To Bed Early To Rise
遂此時眾小和尚引那女子往殿後睡去。長老就在方丈中，請眾院主自在，遂各散去。三藏吩咐悟空：「辛苦了，早睡早起。」遂一處都睡了，不敢離側，護著師父。遂此时众小和尚引那女子往殿后睡去。长老就在方丈中，请众院主自在，遂各散去。三藏吩咐悟空：「辛苦了，早睡早起。」遂一处都睡了，不敢离侧，护着师父。
逐句解 Line by line
So at that time the little monks led the young woman away to sleep behind the hall.
那 is nà here, pointing at a woman already in the room — the deictic reading, against the question word of the two preceding passages.
The Elder settled in the abbot's quarters, begged the assembled cloister-heads to make themselves easy, and so they all dispersed.
自在 is at ease, unconstrained — a Buddhist term of art for the freedom of an enlightened being, used here in its ordinary social sense of do not stand on ceremony.
Tripitaka instructed Wukong, "You have worked hard. Early to bed and early to rise."
早睡早起 is the same folk maxim in Chinese that it is in English, and it is being used here the way a parent uses it — affectionately, and with no idea what the night holds.
So they slept all in one place, not daring to leave his side, guarding their master.
著 is the sustained zhe here, marking an action held open across time rather than completed — guarding, ongoing, all night. This is the first of five in this stretch and the reading carries most of the chapter's load.
Four short lines that put every piece on the board: the woman behind the hall, the monks dispersed, the master in the abbot's room, the disciples sleeping around him and refusing to move away.
That last detail matters enormously. The disciples do guard him. They sleep at his side deliberately and they do not leave. When he is taken, it will not be because anyone was careless — it will be because the thing that takes him arranged for Pilgrim to be several courtyards away, fighting a decoy.
The novel is careful about this. It wants the eventual failure to be a defeat, not a lapse.