Why we get dreams while sleeping?

 

 why we get dreams while sleeping 

Dreams are hallucinations  that occur during certain stages of sleep. They're strongest during REM sleep, or the rapid eye movement stage, when you may be less likely to recall your dream. Much is known about the role of sleep in regulating our metabolism, blood pressure, brain function, and other aspects of health. A dream is a succession of images, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep.

Adults and babies alike dream for around two hours per night. During a typical lifetime, people spend an average of six years dreaming. The average person has three to five dreams per night, and some may have up to seven.

People who are blind from birth do not have visual dreams. Their dream contents are related to other senses like hearing, touch, smell and taste, whichever are present since birth