Americans are finally focusing on getting more sleep, perhaps due to the onslaught of sleep-positive tech like FDA-approved pajamas, weighted blankets, and lamps that mimic the sunrise. There’s still plenty to explore regarding the relationship between snoozing and mental health. And while extensive research and experts have noted links between the two, the findings of one new study in particular will be of interest to summer travelers and busy boss babes alike.

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Recent study of bedtime and wake up time

Published in The Lancet Psychiatry, the study analyzed 91,000 United Kingdom residents aged 37 to 73 who wore an accelerometer on their wrist for one week. Researchers determined the circadian rhythmicity of the subjects’ rest-activity cycles—AKA, how consistent they are about bedtime and wake-up time. They then examined the connection between a regularly disrupted circadian rhythm and conditions such as depression, happiness, and cognitive functioning (using a model that accounted for demographics, lifestyle, education, and other factors that might influence these conditions).

The research findings

The results showed your bedtime changes drastically from day to day, you’re likely to experience poor mental health. “We found that people who tended to have lower relative amplitude, indicating that they’ve got less marked distinction between their rest and activity periods, were more likely to meet the criteria for lifetime depression and bipolar disorder,” lead study author Laura Lyall, PhD, said in a podcast related to the study.
However, the study was not able to prove causality, so it’s possible that poor mental health leads to a tumultuous circadian rhythm rather than vice versa. Still, considering the study’s strong correlation between sleep quality and mental health—causal or not—it should be evidence enough to prioritize consistent shut-eye. After all, making sure your busy work week is accompanied by some sort of structured sleep schedule is vital for functioning at your best. You don’t want to show up to work the next morning feeling as though you’re drunk, right?


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