All our dreams have something to do with (与…有关) our feelings, fears, longings, wishes, needs and memories. But something on the "outside" may have influence on we dream. a person is hungry or tired or cold, his dream may include a feeling of this kind. If the blanket on body has slipped off (滑落) your bed, you may dream that you are or resting on the ice and snow. The material for the dream you will have tonight is probably to come the experiences you have today.

So the subject of your dream usually comes from something that has an influence on you while you are sleeping (feeling of cold, a noise, a discomfort, etc.) it may also use your past experiences and the wishes and interests you have now. This is why very young children are likely to of fairies (仙女) , older of school examinations,people of food, homesick (思乡的) soldiers of their families and prisoners (囚犯) of freedom.