According to the models, six down - regulating genes are responsible for the lack of sleep duration and the last gene is for the longer duration of sleep. (techtimes.com)
While a more recent 2008 meta - analysis completed found that short duration of sleep in both children and adults increased the risk of obesity. (inspiringinterns.com)
Drinking alcohol can disrupt the structure and duration of sleep states, alter total sleep time, and affect the time required to fall asleep. (verywellmind.com)