According to an article in the journal Psychological Bulletin, modern people suffer from lack of sleep, and its effect on emotional well-being has major implications for mental health. Scientists analyzed 154 studies involving 5,715 subjects over 50 years to find out how different forms of sleep deprivation affect emotions. The experiments included three main groups: changing sleep times, long-term sleep deprivation, and intermittent awakenings throughout the night. All three types of sleep deprivation led to a decrease in positive emotions such as joy and satisfaction, as well as an increase in anxiety symptoms, including increased heart rate, reports Around the World.