Well, I THINK: In the bedroom, Paul's last Tuesday night, Helen in her own bed, Paul in the one he took over from Narinder. They are on their own in the dark talking across to each other.
Helen asking Paul if he had ever dreamt about having sex with anyone in the house, because she had!
He said no, and explained why as in Miriam's quote. Helen wished him a nice dream that night, to which he replied:
'Well, let's put it this way: if I wake up with a great big smile on my face you will know what I have been dreaming about'
Of course, I could be wrong,

because they also talked about dreams in the den the night before. I don't think I'm far out though.
What lovely sweet and innocent stuff in comparison to now!