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Research of the American Psychological Association has synthesized over 50 years of studies to understand how sleep loss affects mental health. It is the most comprehensive quantitative synthesis of experimental sleep and emotion research to date.
The analysis was published in the Psychological Bulletin.
Study Overview
American researchers delved into data from 154 studies spanning five decades and involving 5,715 participants. These studies disrupted participants’ sleep for one or multiple nights, employing various methodologies such as prolonged wakefulness, reduced sleep duration, and intermittent awakenings during the night. Each study measured at least one emotional variable: mood, response to emotional stimuli, and indicators of depression and anxiety symptoms.
Impact of Sleep Loss on Mood and Emotions
All three types of sleep deprivation lead to a decrease in positive emotions, particularly joy, happiness, and satisfaction. Additionally, participants exhibited increased symptoms of anxiety, such as accelerated heart rate and heightened worrying.
This occurred even after short periods of sleep loss, like staying up an hour or two later than usual or after losing just a few of hours of sleep. We also found that sleep loss increased anxiety symptoms and blunted arousal in response to emotional stimuli.
Cara Palmer, PhD, study lead author of Montana State University
Symptoms of depression were less pronounced, as were negative emotions like sadness, distress, and stress.
Study Limitations and Future Directions
A primary limitations were the predominantly young participant demographic, average age – 23, and most research from the US and Europe. According to the scientists, future studies should encompass a more diverse age and geographical sample. Other potential avenues could involve investigating the effects of multiple nights of sleep loss and exploring individual differences. Understanding why certain individuals are more vulnerable to the consequences of sleep loss than others is crucial.
The study highlights that over 30% of adults and up to 90% of adolescents experience insufficient sleep. In their view, the implications of this analysis for individual and public health are significant in a society largely deprived of sleep. Industries and sectors with employees prone to sleep deprivation, such as the military, rapid response services, and truck drivers, should develop policies prioritizing sleep to mitigate risks to emotional and mental well-being.
