Explanation:

• Brain is the major computer that controls entire body and never is fully at rest, there are a variety of organs that don’t sleep either.
• Heart works unceasingly, 24/7/365, pumping blood throughout your body and making sure muscles get enough oxygen.
• Lungs continue to work and remove carbon dioxide from your blood and make sure it contains enough oxygen.
• Kidneys—their ability to filter blood and eliminate any toxins from body does not stop simply because you are asleep