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• Sleep quality is more important for the quality of life than sleep duration or “social jetlag”, a new Czech study suggests.
• To date, little research has explored the long-term effects of changes in sleep length or sleep quality on quality of life.
• Researchers at the Department of Sociology, Faculty of Social Sciences at Charles University in Prague, Czechia examined thousands of individual and household data to find a correlation.
• They found that “individuals who experience higher quality sleep also have greater satisfaction with life, more well-being, state registration for pharmacy techs feel healthier, perceive less work stress and are happier.”

Czechian scientists say that sleep quality plays a greater role in influencing the quality of life (QoL) than sleep duration or timing.

Their study, published in the open-access journal PLOS ONE, is among the first to observe the impact of changes in sleep quality over the long term.

It is also the first study to test how social jetlag, a mismatch of internal sleep rhythms and environmental demands, may affect QoL.

Lead authors Michaela Kudrnáčová of Charles University’s Faculty of Social Sciences and Aleš Kudrnáč, Ph.D., of the Institute of Sociology, Czech Academy of Sciences concluded:

“While when we sleep and how long we sleep is important, individuals who have better quality sleep also have a better quality of life, regardless of the time and length of sleep. In addition, by following [4,523] people for three years, we found that those whose sleep improved also had an improved quality of life.”

Previous studies have shown that sleep disruptions and low quality sleep may decrease the quality of life.

Defining quality of life

The Charles University researchers define the quality of life (QoL) as “an interplay between the perception of an internal state, such as the experience of happiness or feeling of good heath or satisfaction, and external events in the surrounding environment, which may include family and career.”

They based their analysis on the parameters of well-being, satisfaction with life, happiness, and meaning in life.

What is social jetlag?

Social jetlag is a term that describes the difference between biological time, determined by internal circadian rhythms, and social times, primarily determined by the external environment. The increasing use of artificial light and nightwork is largely responsible for this pervasive “circadian misalignment”.

Considering that the circadian clock regulates a host of physiological processes, health experts have linked social jetlag with negative health outcomes. These include poor sleep, hypertension, impaired cognitive performance, mental health conditions, and metabolic disorders.

Data on sleep quality, duration, bedtime

The Charles University team consulted data from the Czech Household Panel Study (CHPS), focusing on information collected over three years.

The survey interviewed all members of the sampled households. In each “wave” of data collection, the same members of the same households were asked to contribute.

Czech adults submitted a total of 5,132 self-administered questionnaires about sleep patterns, health, and work in 2018. Responses totaled 2,046 in 2019 and 2,161 questionnaires in 2020.

The drop in the sample between 2018 and 2019 was due to a blood draw requirement.

The experts studied the effect of sleep on the dependent QoL variables described earlier.

For instance, they measured life satisfaction according to responses to the question “All things considered, how satisfied are you with your life as a whole?” They gauged perceived happiness with responses to the question “Taking all things together, how happy would you say you are?”

Additionally, the study measured sleep duration, perceived sleep quality, and social jetlag.

Sleep duration was calculated according to the reported responses regarding sleep and wake times on workdays and free days. Perceived quality of sleep was based on answers to the question “How would you rate the quality of your sleep?”

The researchers calculated social jetlag “as the difference between the mid-sleep time on free days and workdays.”

Individual and household sleep patterns

To evaluate their hypotheses on the effects of sleep aspects on QoL, the Charles University team repeatedly measured the CHPS data within both individuals and households.

They found that social jetlag and sleep duration were important in explaining differences in quality of life between different people. Social jetlag was linked to lower life satisfaction and higher work stress, whilst longer sleep duration was associated with lower levels of happiness and worse subjective health.

However, higher sleep quality was the most important variable as it was associated with better outcomes across all the indicators of quality of life: greater life satisfaction, more well-being, higher happiness, better subjective health, and less work stress.

When they looked at changes within individuals during the study duration, rather than comparing different people, again sleep quality was the most important variable. Changes in a person’s sleep duration or social jetlag did not affect their QoL measures. Contrastingly, improvements in the quality of sleep were associated with increased life satisfaction, well-being, happiness, and subjective health.

This is in agreement with previous research that suggests sleep quality is a strong predictor of QoL.

Study strengths and limitations

Medical News Today discussed this study with David Cutler, MD, a family medicine physician at Providence Saint John’s Health Center in Santa Monica, CA. He was not involved in this work.

Dr. Cutler told MNT that the findings were important, but their shortcomings made him hesitant to draw definitive conclusions:

“Since all data was collected from one country, you may not be able to generalize the conclusions to all countries. And data were collected during the longer summer months, so the results may not apply to the entire year. Results were self-reported, so subject to reporting bias. And since not all questionnaires were returned, selection bias may also apply.”

Dr. Cutler also mentioned that the study did not clarify causality:

“Still, it remains unclear whether the extremes of sleep duration caused poorer quality of life or if those with a poorer quality of life were more likely to have a shorter or longer duration of sleep.”

The study’s authors also acknowledge that causes of social jetlag rarely change, so their research timeframe may not have been long enough to observe any potential effect.

Some of the results may have been affected by the COVID pandemic in the spring of 2020. Consequently, the study might not show sleep patterns under typical circumstances.

Tips for better sleep

Dr. Cutler shared several ways to improve sleep quality without prescription drugs or supplements:

• Stick to a consistent sleep schedule: Go to bed and wake up at the same time every day, even on weekends. This helps regulate your body’s natural sleep-wake cycle.

• Create a bedtime routine: Establish a relaxing routine before bedtime. This could include taking a warm bath or shower, reading a book, or listening to calming music.

• Create a comfortable sleep environment: Ensure your bedroom is cool, dark, and quiet. Invest in a comfortable mattress, pillows, and bedding.

• Limit exposure to screens: Avoid using electronic devices such as smartphones, tablets, or laptops for at least two hours before bedtime.

• Avoid caffeine, nicotine, and alcohol: These substances can disrupt your sleep and make it harder to fall asleep.

• Exercise regularly: Regular physical activity can help improve sleep quality. Just make sure to finish exercising at least a few hours before bedtime.

• Manage stress: Stress can interfere with sleep. Try relaxation techniques such as meditation, deep breathing, or yoga to help calm your mind. A regular routine of cognitive behavioral therapy has been proven to be the best treatment for insomnia.

• Consider seeking medical advice: If you have persistent sleep problems, it’s important to talk to a healthcare professional. They may recommend further evaluation or treatment options.

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