Before the spies lay down for the night, Rahab went up on the roof

Joshua 2:7
So the king's men set out in pursuit of the spies along the road to the fords of the Jordan, and as soon as they had gone out, the gate was shut.

Joshua 2:9
and said to them, "I know that the LORD has given you this land and that the fear of you has fallen on us, so that all who dwell in the land are melting in fear of you.

And before they were laid down, she came up to them on the roof;