Anxiety and depression in paradoxical insomnia: a case-control study

Area of Science:

• Sleep Medicine
• Psychiatry
• Clinical Psychology

Background:

• Insomnia is a prevalent sleep disorder with various subtypes.
• Understanding the psychological comorbidities of different insomnia types is crucial for effective treatment.
• Paradoxical insomnia (Para-I) and psychophysiological insomnia (Psy-I) are distinct diagnostic categories.

Purpose of the Study:

• To compare anxiety and depression levels between patients with paradoxical insomnia (Para-I), psychophysiological insomnia (Psy-I), and normal sleepers (NS).
• To identify specific psychological differences associated with these insomnia subtypes.

Main Methods:

• A cross-sectional case-control study involving 63 patients with Para-I, 63 with Psy-I, and 63 normal sleepers (NS) from southwest China.
• Groups were matched for age, gender, education, and occupation.
• Anxiety and depression were assessed using the Self-Rating Anxiety Scale (SAS) and Self-Rating Depression Scale (SDS).

Main Results:

• Patients with Para-I exhibited significantly higher anxiety scores and incidence compared to NS.
• No significant anxiety differences were found between Para-I and Psy-I groups.
• Para-I patients showed significantly higher depression scores and incidence of moderate to severe depression compared to both Psy-I patients and NS.

Conclusions:

• Both Para-I and Psy-I patients demonstrate significantly elevated anxiety and depression compared to normal sleepers.
• While anxiety levels were comparable between the two insomnia groups, Para-I was associated with significantly higher depression.
• These findings highlight distinct psychological profiles for different insomnia subtypes, informing clinical assessment and management.