Personality and sleep quality: Evidence from four prospective studies

Area of Science:

• Psychology
• Sleep Science
• Longitudinal Studies

Background:

• Personality traits are known to influence various aspects of health and well-being.
• Sleep quality is a critical component of overall health, particularly in middle-aged and older adults.
• Understanding the interplay between personality and sleep longitudinally is essential for targeted interventions.

Purpose of the Study:

• To investigate the longitudinal associations between core personality traits and sleep quality.
• To identify specific personality factors linked to the development or maintenance of poor sleep.
• To examine the bidirectional relationship, exploring how sleep quality influences personality changes over time.

Main Methods:

• Analysis of data from over 22,000 adults aged 30-107 across four large-scale, multi-wave studies (WLS, MIDUS, HRS, MIDJA).
• Assessment of personality traits (neuroticism, extraversion, conscientiousness, agreeableness, openness) and sleep quality at baseline.
• Re-assessment of personality and sleep quality 4-10 years later to establish longitudinal relationships.

Main Results:

• Higher extraversion and lower neuroticism were consistently associated with better sleep quality, both cross-sectionally and longitudinally.
• Low conscientiousness predicted a worsening of sleep quality over time.
• Poor baseline sleep quality was linked to declines in extraversion and conscientiousness, and smaller changes in neuroticism.

Conclusions:

• Robust, replicable evidence supports a longitudinal link between specific personality traits and sleep quality.
• Certain personality profiles (high neuroticism, low extraversion/conscientiousness) are risk factors for poor and deteriorating sleep.
• Findings confirm that poor sleep quality can negatively influence personality trajectories, highlighting a complex bidirectional relationship.