Sleep is a fundamental function and a daily routine in life. A life without sleep is a slow paralysis, a decline in abilities, focus, thinking, and a loss of sensation in life, ultimately leading to death. Sleep allows the body to recharge and provide the energy needed to survive. It helps a person feel refreshed, alert, and capable of thinking, concentrating, and analyzing.
An adult needs 7–9 hours of sleep at night, and children under five years need even more. Despite the limited early research on sleep, scientists have recently intensified efforts to uncover its secrets. A series of fascinating findings have given the world a new perspective on sleep, as it supports the body in many ways. Below are the most important reasons why we sleep.
Why do we sleep? To conserve energy by reducing metabolic rates during sleep, saving up to 35% of daily energy that a person needs to carry out everyday tasks and activities.
There is a restorative theory that states the body needs sleep to restore itself. Sleep repairs cells and helps in building new ones. Supporting this theory are many important processes that occur during sleep, including:
During sleep, the central nervous system eliminates waste and toxins that accumulate throughout the day and can impact brain function. This cleansing allows the brain to function well upon waking. Furthermore, sleep enhances memory by processing information and converting short-term memories into long-term ones, or by erasing unnecessary information that may clutter the nervous system. Sleep also significantly affects brain functions such as learning, problem-solving, creativity, decision-making, focus, and more.
Why do we sleep? Certainly to gain emotional well-being. During sleep, brain activity increases in areas responsible for emotion regulation, which supports healthy brain function and emotional stability. One such area is the amygdala, the brain region responsible for fear, which governs reactions to perceived threats like stressful situations.
Why do we sleep? To maintain our weight. Sleep regulates hunger hormones like ghrelin, which increases appetite, and leptin, which enhances feelings of fullness after eating. During sleep, ghrelin production decreases because the body expends less energy compared to being awake. However, sleep deprivation increases ghrelin and suppresses leptin, leading to a hormonal imbalance that makes a person hungrier. This, in turn, raises the risk of overeating and weight gain.
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