Some of them are short-term effects, and if sleep deprivation continues, it will lead to chronic diseases and negatively impact your health. These health problems include: reduced brain activity, cognitive dysfunction, mood swings, depression, yawning, memory problems, hallucinations, accident proneness, cold and flu, weekend immune system, weight gain, hypertension, diabetes type 2, heart problems and accidental problems. death (Pietrangelo, 2014). When we don't get enough sleep, our brain can't function properly. It affects our cognitive abilities and our emotions. If it continues for a longer period of time, it will cause chronic diseases. Sleep deprivation tires the brain. It makes you feel lazy, uncreative and unable to learn new things. short and long term memory is affected drastically. They make you feel more irritated and moody. If sleep deprivation continues for a longer period, it will cause hallucinations, depression, and suicidal thoughts. Cytokines, chemicals that fight infections, are produced by the immune system during sleep and fight viruses and bacteria. Sleep deprivation therefore prevents the production of those cytokines; you are less protected from diseases. A weakened immune system also means breathing problems and catching colds more quickly. Some studies have found a relationship between lack of sleep and weight gain according to Harvard Medical School. Sleep deprivation increases the release of cortisol which leads to depression and increases insulin in the blood which leads to type 2 diabetes. Because you don't get enough sleep, your blood vessels are less likely to be repaired. This leads to cardiovascular and heart disease (Pietrangelo,