The content in a dream is sometimes related to the dreamer's feelings at that time. If the dreamer feels cold when sleeping, he may dream of walking barefoot in the ice and snow; If you have a toothache, you may dream that all your teeth have fallen out. If you want to pee, you may look for the toilet everywhere in your dream, and you are anxious as hell.
Scientists tell us that a fetus dreams in its mother's belly.
People can dream, but what about animals? Animals dream, too. When they dream, their eyes move quickly under trembling eyes. For example, a cat may catch more mice in its dream than it actually catches.