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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.
Studies show that lack of sleep can lead to unfriendly and reclusive behavior, and has the same impact on the people around you. As a result, unslept people are lonelier.
The first purpose of sleep is restoration.
Every day, your brain accumulates metabolic waste as it goes about its normal neural activities. Sleeping restores the brains healthy condition by removing these waste products. Accumulation of these waste products has been linked to many brain-related disorders.