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REM, the Rapid Eye Movement stage of sleep happens when our eyes are moving fast; we are said to be dreaming in that stage.
NREM (Non-Rapid Eye Movement) is the stage of sleep when we are in deep sleep and are not moving. In this stage, our brain is able to clear toxins and consolidate memories.
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One of the areas of the brain that’s most active during dreaming is the amygdala - the part of the brain associated with the survival instinct and the fight-or-flight response.
One theory suggests dreams may be the brain’s way of getting you ready to deal with a threat. Fortunately, the brainstem sends out nerve signals during REM sleep that relax your muscles. That way you don’t try to run or punch in your sleep.
One theory for why we dream is that it helps facilitate our creative tendencies.
Without the logic filter, you might normally use in your waking life that can restrict your creative flow, your thoughts and ideas have no restrictions when you’re sleeping.