A study of adolescents found that sleep regularity moderates the relationship between sleep difficulties and mental health symptoms. Adolescents who had trouble sleeping on one night tended to show more mental health symptoms the following day. However, the effects of these disturbances on somatic symptoms were somewhat reduced in adolescents with more regular sleep patterns. The paper was published in the Journal of Sleep Research.
Sleep is a natural, restorative state in which the body and brain undergo vital processes for physical and mental recovery. It plays a key role in memory consolidation, immune system function, and hormone regulation. Adequate sleep is essential for emotional stability, cognitive performance, and decision-making.
Poor sleep or chronic sleep deprivation is linked to a higher risk of mental health conditions such as depression, anxiety, and irritability. It also increases the risk of physical health problems like heart disease, obesity, and weakened immunity. Quality sleep helps regulate stress responses and supports overall resilience. Both sleep duration and sleep quality are important for maintaining health across the lifespan.
Despite this, adolescent sleep quality is a global health concern. For example, U.S. national surveillance data estimate that between 65% and 80% of adolescents do not get enough sleep or experience other sleep difficulties. Adolescents with poor sleep tend to have poorer mental health and are more likely to display behavioral problems.
Study author Jinjin Yan and colleagues sought to investigate the daily associations between sleep difficulties and adolescents’ internalizing mental health symptoms. They also examined the links between sleep regularity and these symptoms, and whether sleep regularity moderates the impact of daily sleep difficulties on mental health. Internalizing symptoms are emotional and psychological problems directed inward, such as anxiety, depression, and social withdrawal.
The researchers analyzed data from the first wave of a four-year longitudinal study that included 350 adolescents recruited from five high schools in an urban area in the northeastern United States. The average age of participants was 14 years, and 69% were girls. The sample was racially and ethnically diverse.
Participants completed a subjective assessment of sleep quality using the Pittsburgh Sleep Quality Index and also wore actigraphs for 14 consecutive days. Actigraphs are wearable devices that monitor movement and are commonly used to estimate sleep patterns and physical activity levels.
During the same 14-day period, participants also completed daily assessments of anxiety and somatic symptoms. Somatic symptoms are physical symptoms—such as pain, fatigue, or dizziness—that cannot be fully explained by a medical condition and are often linked to psychological distress.
The results showed that adolescents who needed more time to fall asleep (longer sleep latency) tended to report more severe anxiety and somatic symptoms. Similarly, adolescents who experienced more sleep disturbances also reported higher levels of these symptoms. In other words, on days when adolescents had more trouble sleeping, they tended to feel worse the next day.
Adolescents with more regular sleep patterns tended to have slightly fewer symptoms of anxiety and somatic complaints. Sleep regularity also moderated the relationship between sleep disturbances and these symptoms. Specifically, more consistent sleep patterns helped buffer the negative effects of sleep disturbances on adolescents’ somatic symptoms.
“Assessing day-to-day consistency in sleep/wake patterns (i.e. sleep regularity), this study contributes to the literature on adolescent sleep and mental health by unpacking the complex interplay between sleep regularity and daily sleep difficulties on adolescent internalizing symptoms. The results observe the important role of sleep regularity as a modifiable protective indicator that protects against the detrimental impact of sleep difficulties on adolescent internalizing symptoms,” the study authors concluded.
The study sheds light on the links between sleep and mental health. However, it is important to note that the study focuses solely on short-term, immediate mental health outcomes of sleep disturbances and does not examine the long-term consequences of poor sleep.
The paper, “Sleep difficulties and adolescent internalising symptoms: The moderating role of sleep regularity,” was authored by Jinjin Yan, Mingjun Xie, Zhenqiang Zhao, Jiwoon Bae, Heining Cham, Mona El-Sheikh, and Tiffany Yip.
