Study of Delayed Sleep Phase Disorder and Its Familial Links
Author Information
Author(s): Daniel F. Kripke, Katharine M. Rex, Sonia Ancoli-Israel, Caroline M. Nievergelt, Walt Klimecki, John R. Kelsoe
Primary Institution: University of California, San Diego
Hypothesis
Is Delayed Sleep Phase Disorder (DSPD) familial and associated with depression?
Conclusion
The study indicates that DSPD is familial and linked to unipolar depression.
Supporting Evidence
- DSPD cases reported going to bed and waking up about 3 hours later than controls.
- DSPD participants had significantly poorer sleep quality and higher rates of depression compared to controls.
- Family history of late bedtimes was more common among DSPD cases.
Takeaway
Some people have trouble going to bed early and waking up on time, and this can run in families. This study found that those who struggle with this often also feel more depressed.
Methodology
The study recruited 205 DSPD participants and 221 controls, collecting DNA samples and sleep habit questionnaires, and used actigraphy to monitor sleep patterns.
Potential Biases
Potential bias due to self-selection of participants and reliance on subjective measures.
Limitations
The study's reliance on self-reported data may introduce bias, and the sample was limited to a specific geographic area.
Participant Demographics
Participants were primarily adults aged 22 to 78, with a gender distribution of approximately 65% female.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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