Joshua 2:8

Asleep. It seems as if the spies had been ignorant of the danger to which they had been just exposed, and had gone to the roof of the house with a design to pass the night in greater security. Rahab perceives, however, that it would be extremely rash for them to continue with her any longer, and therefore she gives them the best advice, to secure their safety by fleeing in the dead of the night, and without further delay. (Haydock)