A dream is generally thought to be the imagery, thoughts and feelings one experiences while asleep.
Neurology of dreams
There is no universally agreed biological definition of dreaming. General observation shows that dreams are strongly associated with Rapid eye movement sleep, during which an electroencephalogram shows brain activity to be most like wakefulness. Participant-remembered dreams during non-REM sleep are normally more mundane in comparison. During a typical lifespan, a human spends a total of about six years dreaming (which is about 2 hours each night). It is unknown where in the brain dreams originate, if there is a single origin for dreams or if multiple portions of the brain are involved, or the purpose of dreaming is for the body or mind.
Stages of sleep
When the body decides that it is time to sleep, neurons near the eyes begin to send signals throughout the body. According to Dr. J. Allan Hobson of Harvard University, these neurons are located in such close pr