What dream does Laila have in chapter 26? When she recalls the dream later in the same chapter, why is it ironic and significant?

In the dream, she and Tariq are sitting on a beach and she tells him to listen to the singing sand. The sand sings beautiful notes: "groaning" and "mewling," Hosseini suggests the sand, in its shifting, sings foreshadowing strife that lies ahead for Laila and Tariq. Laila recalls the sand right before a rocket hits her house is proof of this. Through this symbol, the reader is reminded of the transitory nature of life — no matter what Laila and Tariq plan for each other, and for their families, they cannot control all aspects of their fates.