Study: Irregular Sleep Increases Risks of All Types of Mortality

For good health, sleep is vital. The risk of developing various diseases increases if people sleep too little or too much. Japan has shown that this is what Japan research shows. Sleeping Any sleep disruptions or prolonged periods of eight hours could increase your risk of all forms of death.

The Department of Epidemiology for Community Health and Medicine, Kyoto Prefectural University of Medicine, Japan, conducted a massive study that began in 2005 and lasted for nine years.

These results indicated that all-cause mortality rates increased by 15%-30% when people slept too little or infrequently. These results are the Results These were published in ScienceDirect, a British journal, on October 10, 2022.

Teruhide and his colleagues used data taken from the Japan Multi-Institutional Collaborative Cohort Study (JMICS) to examine the link between sleep irregularity & mortality.J-MICC).

J-MICC is an prospective cohort study that aims to examine the relationship between Japanese lifestyle and diseases. The study tracked 736,319 people-years (mean 9.01 years), from 2005 to 2014. 3,376 deaths were also recorded. The mortality rate for 1,000 people was 4.59.

The research team split the group into six different subgroups based on sleep duration and regularity. They then compared the mortality rates among these groups.

Participants who slept between six and eight hours a night had a 15% higher mortality rate than those who only slept six to eight hours. Participants who slept irregularly died 30 percent more than those who slept consistently.

The research team split all participants into six different groups based upon their sleep duration and frequency: those who slept for less than six hours, six to eight hourly, and those who slept more than eight hours. Each group was then further sub-divided into those who slept frequently and those who slept irregularly.

The research team used the sleep-inducing group as the control. It also compared the risk of death of other groups by taking into account other factors (age, gender and BMI, smoking habits and drinking habits, exercise habits, education, location, stroke history, and other health conditions).

The results revealed that those who slept more than eight hours per night had a 14 percent higher chance of dying.

Participants who slept irregularly, regardless how long they slept, had significantly higher mortality rates. This was true for all types of mortality.

This study showed a link between all-cause mortality and sleep irregularity in large Japanese populations. It further confirms the importance of considering not only the length of sleep but also the regularity of sleep schedules.

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