"Harry talks in his sleep… have you noticed?"
Hermione gave Ron a weird look before climbing through the door that lead to the Chamber of secrets. Ron quickly clambered in after her, still thinking about some of the things Harry says in his sleep.
"Mmm… butterbeer"
"Ginny… bad touch… no"
"Ron's big hands"
"Ugh… Ron! Right there!"
Ok… maybe that last one wasn't in his sleep, but the activities causing the speech definitely got Harry to go to sleep.