Total sleep time as a predictor of suicidal behaviour

Area of Science:

• Sleep Science
• Psychiatry
• Public Health

Background:

• Insomnia symptoms are established predictors of suicide.
• The relationship between hypersomnia and suicide risk remains less understood.
• Subjective reports of insomnia may not fully capture suicidal ideation compared to objective sleep duration.

Purpose of the Study:

• To investigate the association between total sleep time and suicidal behavior.
• To compare the predictive power of total sleep time versus insomnia symptoms on suicidal ideation.
• To examine the mediating role of depressive and insomnia symptoms in the relationship between sleep and suicidal behavior.

Main Methods:

• Secondary data analysis of existing sleep and mental health data.
• Statistical modeling to assess direct and indirect effects.
• Inclusion of a squared term for total sleep time to account for non-linear relationships.

Main Results:

• Total sleep time, both short and long durations (indicated by the squared term), showed a significant positive association with suicidal behavior.
• Total sleep time had significant negative direct effects on both insomnia and depressive symptoms.
• Depressive symptoms significantly mediated the relationship between total sleep time and suicidal behavior, whereas insomnia symptoms did not.

Conclusions:

• Total sleep time is a crucial factor in assessing suicide risk.
• Clinical evaluation should prioritize the assessment of total sleep time over subjective insomnia reports.
• Understanding the non-linear relationship between sleep duration and suicidal behavior is vital for intervention.