Central Nervous System
Your central nervous system is the information highway of your body. Sleep is necessary to keep it functioning properly. During sleep, the brain rests busy neurons and forms new pathways so you’re ready to face the world in the morning. In children and young adults, the brain releases growth hormones during sleep. While you’re sleeping, your body is also producing proteins that help cells repair damage.
Sleep deprivation leaves the brain exhausted, so it can’t perform its duties well. The most obvious effect is sleepiness. You may find yourself yawning a lot and feeling sluggish. Lack of sleep interferes with your ability to concentrate and learn new things. It can negatively impact both short-term and long-term memory. It gets in the way of your decision-making process and stifles creativity. Your emotions are also affected, making you more likely to have a short temper and mood swings. Overall cognitive function is impaired.
When you’re sleeping, your immune system produces protective cytokines and infection-fighting antibodies and cells. It uses these tools to fight off foreign substances like bacteria and viruses. These cytokines and other protective substances also help you sleep, giving the immune system more energy to defend against illness.
Sleep deprivation means your immune system doesn’t have a chance to build up its forces. According to the Mayo Clinic, studies show that if you don’t get enough sleep, it’s more likely that your body won’t be able to fend off invaders. It may also take you longer to recover from illness. Long-term sleep deprivation raises your risk of developing chronic illnesses like diabetes and cardiovascular diseases.
Since sleep deprivation can weaken your immune system, you’re more vulnerable to respiratory problems like the common cold and influenza. If you already have a chronic lung disease, sleep deprivation is likely to make it worse.
According to Harvard Medical School, a few studies have found a link between lack of sleep and weight gain. Along with eating too much and not exercising, sleep deprivation is one of the risk factors for obesity.
Sleep deprivation increases production of the stress hormone cortisol. Lack of sleep lowers your levels of a hormone called leptin, which tells your brain that you’ve had enough to eat. In addition, it raises levels of a biochemical called ghrelin, which is an appetite stimulant.
Sleep deprivation prompts your body to release higher levels of insulin after you eat, promoting fat storage and increasing your risk of developing type 2 diabetes.