Circadian Rhythms and Sleep in Familial Delayed Sleep Phase Syndrome (DSPS) and Advanced Sleep Phase Syndrome (ASPS)

The recruitment status of this study is unknown because the information has not been verified recently.
Verified July 2012 by Northwestern University.
Recruitment status was  Recruiting
Information provided by:
Northwestern University Identifier:
First received: October 27, 2005
Last updated: July 19, 2012
Last verified: July 2012

The purpose of this study is to determine the properties of circadian rhythms and sleep propensity in familial advanced and delayed sleep phase syndrome (DSPS).


Study Type: Observational
Official Title: Circadian Rhythms and Sleep in Familial DSPS and ASPS

Further study details as provided by Northwestern University:

Biospecimen Retention:   Samples Without DNA


Estimated Enrollment: 156
Study Start Date: September 2003
People with delayed sleep phase syndrome (DSPS).
People with advanced sleep phase syndrome (ASPS).
Control group.

Detailed Description:


Tremendous progress in the past few years has led to the identification of several circadian clock genes. This now makes it possible to determine how alterations of human circadian clock genes and their expression could lead to differences in circadian and sleep/wake cycle phenotypes. Of particular interest for understanding genetics of the human circadian system are individuals with sleep phase disorders, such as DSPS and advanced sleep phase syndrome (ASPS), because recent studies indicate a genetic basis for these disorders. While it is assumed that both ASPS and DSPS are disorders of circadian timing, little is known about how the circadian clock system, or its interaction with sleep processes, are affected in these individuals.


Participants will complete questionnaires to determine sleep quality.


Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population

Subjects with circadian rhythm sleep disorders and healthy age and gender matched controls


Inclusion Criteria for ASPS Participants:

  • Morning type score on the Horne-Ostberg questionnaire
  • Advanced melatonin onset

Inclusion Criteria for DSPS Participants:

  • Evening type score on the Horne-Ostberg questionnaire
  • Delayed melatonin onset

Inclusion Criteria for Controls:

  • A stable sleep/wake pattern with a normal phase relationship to the environment and no history of sleep disorders

Exclusion Criteria for all subjects:

  • Sleep disorder, other than DSPS or ASPS, as assessed by the Pittsburgh Sleep Quality Index and/or by PSG
  • History of cognitive or other neurological disorders
  • History of DSM-IV criteria for any major psychiatric disorder, alcohol or substance abuse
  • Abnormal mood as assessed by the Hamilton Depression Scale
  • History of, or concurrent, unstable or serious medical illness
  • Current use of psychoactive medications, including antidepressants, anxiolytics, neuroleptics, anticonvulsants, hypnotics, and stimulant medications
  • Shift work
  • Having a daily caffeine intake greater than 4 cups per day
  • Smoking
  • Travel across more than 2 time zones within 90 days of the study
  • Pregnancy or the desire to become pregnant during the study period
  Contacts and Locations
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Please refer to this study by its identifier: NCT00246454

United States, Illinois
Northwestern University Recruiting
Chicago, Illinois, United States, 60611
Contact: Kathryn Reid    312-503-1528   
Principal Investigator: Phyllis C. Zee, MD, PhD         
Sponsors and Collaborators
Northwestern University
Principal Investigator: Phyllis C. Zee, MD, PhD Northwestern University
  More Information

Reid K. J., Zee P.C. (2005) Circadian Disorders of the Sleep-Wake Cycle. Kryger, Roth, Dement (ed's) Principle and Practices of Sleep Medicine, 4th Ed. Saunders.

Responsible Party: Phyllis C. Zee, Northwestern University Identifier: NCT00246454     History of Changes
Other Study ID Numbers: 341, R01HL069988, R01 HL069988
Study First Received: October 27, 2005
Last Updated: July 19, 2012
Health Authority: United States: Federal Government processed this record on October 23, 2014