Night people are shown to have a 10% higher risk of death from any cause than morning people. This conclusion was formed after researchers controlled for age, sex, smoking, body mass index, sleep duration, and other variables presumed to affect life expectancy, in a sample of 433,268 people aged 38 to 73. Participants classified themselves as “definite morning”, “moderate morning”, “moderate evening”, and “definite evening” people and the researchers followed each of them for about six years. Not only did “definite evening” show a 10 percent increased risk of death than the “definite morning” group, each of these intervals between the two types in classification saw a significantly increased risk of disease. Night owls were 30 percent more likely to have diabetes and twice as likely to have a psychological disorder than morning people. The size, length, and statistically significant results of this study make it credible; night people can decrease risk by gradually making their bedtime earlier and not bringing smartphones to bed with them to make it more likely that they fall asleep right away.