Jonas dreams that he is on a sled trying to get somewhere.
Jonas does not often dream, so he usually does not describe his dreams during the morning dream telling. However, after helping Fiona volunteer at the House of the Old, Jonas has a dream about Fiona in a bath tub. He wants her to take off her clothes. He remembers the wanting more than anything else about the dream. When he tells his parents, they understand.
"I knew that she wouldn't. And I think I knew that she shouldn't. But I wanted it so terribly. I could feel the wanting all through me." (Ch. 5, p. 36)
His parents give him pills for Stirrings, or the beginnings of sexual feelings. Jonas rarely dreams after that. However, one day he does dream. He lies when his parents ask him about it, because it is related to his training.
Again and again, as he slept, he had slid down that snow-covered hill. Always, in the dream, it seemed as if there were a destination: a something—he could not grasp what—that lay beyond the place where the thickness of snow brought the sled to a stop. (Ch. 12, p. 88)
Jonas is aware that the dream is related to the memory he received about the sled. He also knows that as disturbing as the dream was, it meant something. He describes the place he wanted to go in the distance as “welcoming.”
This dream foreshadows Jonas’s eventual escape. The ending of the book actually involves a sled. Jonas uses the sled to get to Elsewhere, where the world exists without Sameness.
Lowry, Lois (1993-04-26). The Giver (Newbery Medal Book). Houghton Mifflin Harcourt. Kindle Edition.