ISLAMABAD: "Social jet lag" is a term that describes what happens when people go to sleep and wake up later on weekends than they do during the week. A new study assesses the impact of social jet lag on overall health.

The new research - led by senior author Michael A. Grandner, Ph.D., director of the Sleep and Health Research Program at the University of Arizona in Tucson - examined data from 984 adults aged between 22 and 60 years. The results were also presented at SLEEP 2017, which is the 31st Annual Meeting of the Associated Professional Sleep Societies, held in Boston, MA.The researchers also assessed insomnia using the Insomnia Severity Index and accounted for additional factors that may have influenced the results, including age, sex, race and ethnicity, education, employment status, income, and sleep duration.

The study revealed associations between social jet lag and worse mood, sleepiness, and fatigue, as well as poorer overall health.

More specifically, with each hour of social jet lag, the researchers found an 11.1 percent increase in the likelihood of developing heart disease.

Furthermore, every hour of social jet lag was associated with a 22.1 and 28.3 percent increase in the likelihood of having just "good" or "fair/poor" health, respectively, compared with "excellent" health.

The results did not depend on insomnia or sleep duration, so the jet lag on its own may be responsible for these health outcomes.

Lead author Sierra B. Forbush, an undergraduate research assistant in the Sleep and Health Research Program at the University of Arizona in Tucson, comments on the findings.

"These results indicate that sleep regularity, beyond sleep duration alone, plays a significant role in our health. This suggests that a regular sleep schedule may be an effective, relatively simple, and inexpensive preventative treatment for heart disease as well as many other health problems."

Additionally, the study found that high school graduates had greater social jet lag compared with college graduates, and that those in the highest income category had more minutes of social jet lag compared with their lower-earning counterparts.

Additionally, the AASM suggest that young adults, people who are trying to recover from a "sleep debt," and people who are ill, may all benefit from sleeping for longer than 9 hours per night.