Why do people dream? What does the dream represent?

Generally speaking, everyone dreams every time he sleeps, and dreams all the time when he sleeps, but when he wakes up, he will only be the last one. Of course, this situation is usually awakened by others or by dreams (nightmares). If you sleep naturally and remember your dreams (one of them), you have a strong memory.

Of course, some friends say that dreaming is a spiritual call caused by others thinking about you while you are sleeping.