During REM sleep, we receive no sensory input, and those neurons are constrained. If we see, for example, a tree during a dream, the neurons react in the same manner as if they were seeing a wakeful-world tree. EEG readings during REM sleep. When a person is awake and attentive, brain waves are spiked and short. EEG readings become more animated as the person shifts from deep sleep to dreaming.
Alpha rhythms are more conspicuous when the dream scenario is passive than when it is busy.
The brain during REM sleep. The information-processing function of dreams. While we sleep, one of the brain's tasks is to process information which was acquired while we were awake. Another advantage is that the unconscious mind can review our wakeful life without the interference of the conscious mind's rigid style of reasoning, limited creativity, habitual patterns of thought, and restricted access to psychological and spiritual resources which are available to the unconscious mind. Memories are processed during sleep.