A person progresses through different stages of sleep, where the body temperature drops, muscles relax, and the heart rate slows down. The deepest stage of sleep induces physiological changes that help in boosting immune system functioning. Sleep deprivation affects our psychological state, which can lead to depression and anxiety. Roughly one-quarter of the world’s population suffers from this condition. Lack of sleep is linked to several unwanted health consequences, such as heart disease and diabetes. No wonder why people turn towards insomnia pills for instant relief!