I slept sound last night I can wake many nights when I am put to it.Who says this?rachael or Stephen?

Rachel says this;

"I slept sound last night. I can wake many nights, when I am put to it. ’Tis thou who art in need of rest — so white and tired. Try to sleep in the chair there, while I watch. Thou hadst no sleep last night, I can well believe. Tomorrow’s work is far harder for thee than for me."