770 Does Improving Sleep Lead to Better Mental Health? A Meta-Analysis of Randomised Controlled Trials

Abstract

Introduction: Sleep and mental health go hand-in-hand; however, the extent to which sleep is causally related to the experience of mental health difficulties is unclear. One way to test whether there is a causal link is to evaluate the extent to which interventions that improve sleep also improve mental health over time. Methods: We conducted a systematic review and meta-analysis of 54 randomised controlled trials (N = 6,876) that reported the effects of interventions that successfully improved sleep on overall composite mental health, as well as on six specific mental health difficulties including depression, anxiety, stress, psychosis spectrum experiences, suicidal ideation, and PTSD. Results: Improving sleep had a medium-sized effect on composite mental health (g+ = -0.47), and depression (g+ = -0.54), small-tomedium sized effects on anxiety (g+ = -0.40), and stress (g+ = -0.42), and small effects on positive psychosis spectrum experiences (g+ = -0.26). We also found a significant dose response relationship, in that greater improvements in sleep were associated with greater improvements in composite mental health. Conclusion: Taken together, the findings suggest that sleep is causally related to the experience of mental health difficulties. Improving sleep leads to better mental health, especially for experiences of depression, anxiety, and stress. Future research might profitably consider how interventions that improve sleep be better incorporated into routine mental health care, as well as the possible mechanisms of action that might explain how sleep exerts its effects on mental health.