First things first, Greg is supposed to walk in on Grissom and Sara in the same room. Not doing anything, but in the same room together. Grissom is sharing a room with Greg, and Sara has her own room. During the night Greg is snoring too much, so Grissom goes to Sara's room, where she has 2 beds side by side. She lets him in and the lie in separate beds talking---in the dark---about life, death, love, thing relating to the case, with some personal stuff thrown in. And then we see them in the morning again, Sara has just walked out of the shower in Grissom's room(i think thats what was said) and then you are left to wonder what happened in between that and how did Sara end up in Grissom's room..