(HBP: "Will and Won't," US, p. 38):
Harry Potter was snoring loudly. [END QUOTE]
Well, I guess that from this description you can tell that he was sound asleep. The reader is not told what, if anything, Harry was dreaming about. This is of course significant.
It was night time. Late one summer evening at 4 Privet. Harry had received a letter from Professor Dumbledore, himself, which had announced that the Professor would make a house call that Friday at 11pm, to take Harry to his friends, the Weasley's, house -- known as The Burrow. Harry had fallen asleep in a chair by the bedroom window after 4 hours peering for a sign of Dumbledore.
Sleep and dreams.
Throughout the past school year (12 months?), Harry's dreams had been horribly disrupted by visions. He was told, after an amazing rescue of Arthur Weasley, that a link existed between his mind and Voldemort's. Harry's dreams were glimpses into the consciousness of Voldemort's own mind. (I doubt either of the two got a good night's sleep that year -- does Voldemort ever sleep?)
Food in the wizarding world may be said to represent, well -- Food. Shelter -- Protection. But what does Sleep represent in the Harry Potter Series?