Warning: The following dream sequence DOES NOT BELONG TO ME. I merely thought I should integrate some of Harry't more relevant dreams, since I'm going through the books in order. Thanks.
"Perhaps Harry had eaten a bit too much, because he had a very strange dream. He was wearing Professor Quirrell's turban, which kept talking to him, telling him he must transfer to Slytherin at once, because it was his destiny. Harry told the turban he didn't want to be in Slytherin; it got heavier and heavier; he tried to pull it off but it tightened painfully - and there was Malfoy, laughing at him as he struggled with it - then Malfoy turned into a hook-nosed teacher, Snape, whose laugh became high and cold - there was a burst of green light and Harry woke, sweating and shaking."