Depression as a confounding variable in the estimation of habitual sleep time

Area of Science:

• Psychology
• Sleep Medicine
• Epidemiology

Background:

• Self-reported sleep duration is linked to mortality risks.
• Research often overlooks psychological factors in sleep duration reporting.
• Anxiety and depression may influence how individuals report their sleep habits.

Purpose of the Study:

• To investigate the influence of anxiety and depression on self-reported habitual sleep times.
• To examine the discrepancy between initial sleep estimates and objective sleep diary data.
• To understand the role of psychological factors in sleep duration reporting.

Main Methods:

• Assessed relative and absolute discrepancies in sleep time reporting.
• Utilized a 2-week sleep diary alongside initial sleep duration estimates.
• Examined associations between mood (depression, anxiety) and sleep reporting accuracy.

Main Results:

• Depressed mood correlated with underestimating sleep duration (relative discrepancy).
• Depressed mood was associated with exaggerating reported sleep time (absolute discrepancy).
• Psychological factors significantly alter habitual sleep time reports.

Conclusions:

• Mental health status, particularly depression, is a critical confounder in sleep duration research.
• Future studies on sleep duration and mortality must account for psychological well-being.
• Accurate assessment of sleep requires consideration of mood and its impact on reporting.