AP PSYCHOLOGY

Detailed explanation-1: -During sleep, there are enzymes that repair brain cell damage caused by free radicals. In contrast, lack of sleep does not allow our brain to function normally because of the neurotransmitters, and neurons that are unable to rest or regenerate [13].

Detailed explanation-2: -New research shows for the first time that important immune cells called microglia–which play an important role in reorganizing the connections between nerve cells, fighting infections, and repairing damage–are also primarily active while we sleep.

Detailed explanation-3: -The researchers found that sleep provides a time when the brain’s synapses-the connections among neurons-shrink back by nearly 20 percent. During this time, the synapses rest and prepare for the next day, when they will grow stronger while receiving new input-that is, learning new things, the researchers said.

Detailed explanation-4: -Deep sleep is restorative. Your body replenishes its energy and repairs cells, tissues, and muscles. You need this phase to feel awake and refreshed the next day.