When Human sleep they will outside of world. This time transformed into a direful way, creating a dream vision. However, the main components of the dream are made from everyday life experiences and from memories.
Tired people do not dream first two hours sleeping. Two hours before the body takes complete rest and dream is called the fast eye movement period. The time when people do not dream during sleep, it is called non-rapid eye movement period. In almost every 90 minutes of sleep, REM sleep is seen for about 10 minutes. Sleep sleeps 4/5 times in REM. That is every day people see at least 4/5 dreams.