“There is a time for many words, and there is also a time for sleep.” — Homer
Sleep, like food and water, is essential for humans to survive. Sleep affects almost every type of tissue and system in the human body. The brain, heart and lungs perform functions while you sleep. Similarly, your metabolism and immune system perform functions while you are sleeping. Sleep also affects your mood and ability to resist and fight diseases. Research shows that a chronic lack of sleep, or getting poor quality sleep, increases the risk of cardiovascular disease, diabetes, depression, and obesity. The next day you feel exhausted, tired, or fatigued after a poor night’s rest.
What is sleep?