Erratic Sleep Schedules Can Harm Mental Health, Study Finds

An erratic sleep schedule can harm mental health by disrupting internal body clocks, according to a study published on Everyday Health.

Key Clinical Takeaways:

• Adults with shifting bedtimes and wake times reported more symptoms of depression, anxiety, and loneliness.
• The study analyzed data from nearly 23,000 Oura Ring users who contributed about five months of sleep data.
• Researchers found that consistent wake times improve mental well-being, even regardless of total sleep duration.

The quality of sleep impacts mental health in ways beyond simple sleep duration. Adults whose bedtimes and wake times shifted day-to-day experienced higher rates of depression and anxiety symptoms, along with increased feelings of loneliness, compared to those maintaining regular schedules.

“We found that maintaining a regular sleep schedule — waking up at the same time each day and going to bed at the same time each night — was associated with better mental health,” said Ashley E. Mason, PhD, an associate professor in residence in the psychiatry and behavioral sciences department at the University of California in San Francisco, told Everyday Health.

To examine the connection, researchers evaluated data from nearly 23,000 Oura Ring users with an average age of 46. The smart rings tracked movement and vital signs to estimate sleep and wake times. Participants contributed an average of about five months of sleep data alongside monthly surveys regarding depression, anxiety, and loneliness.

Investigators assigned each participant a sleep regularity score between 0 and 100 using the ring data. A score of 100 represented identical bedtimes and wake times daily. An 84 corresponded to shifting sleep timing by about an hour earlier or later, while a 75 reflected shifts of roughly an hour and a half.

Severe depression symptoms tracked alongside lower sleep regularity scores. Participants reporting few or no depression symptoms averaged a score of 84, while those with mild symptoms averaged 83, moderate symptoms averaged 81, and severe symptoms averaged 75.

“There are so many regulatory processes and chemicals at work in our bodies that rely on timing throughout the day,” said Neal Walia, MD, a sleep medicine specialist at UCLA Health in Los Angeles, who was not involved in the study, told Everyday Health. Hormones like melatonin and cortisol depend heavily on stable circadian alignment.

Study authors said that the findings do not definitively prove that irregular sleep causes mental health issues, as the reverse relationship remains a possibility. However, maintaining consistent wake times can help stabilize circadian rhythms.

“Instead of worrying about how much sleep you get, which is often out of your control, focus on something you can control: the time you wake up,” Mason told Everyday Health.

Disclaimer: The information provided in this article is for educational and scientific communication purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider regarding any medical condition, diagnosis, or treatment plan.