Examining the Biological Factors That Affect Sleep Duration
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|ClinicalTrials.gov Identifier: NCT00607204|
Recruitment Status : Completed
First Posted : February 5, 2008
Last Update Posted : July 31, 2013
|Condition or disease|
|Sleep Circadian Rhythm Cognitive Performance|
The amount of sleep people require depends on many factors, including age, but experts agree that most adults need 7 to 8 hours of sleep a night. People who sleep for shorter or longer amounts of time may be at risk of developing memory problems, heart disease, obesity, and diabetes. The duration and timing of sleep are regulated by an interaction between the circadian pacemaker, or biological clock, and the sleep homeostat, which is an internal account of the amount of sleep a person has received recently. It is unknown whether there is a biological or genetic basis for the amount of sleep a person needs. This inpatient study will examine two extreme sleep groups: short sleepers who sleep 6.5 or less hours a night and long sleepers who sleep 9 or more hours a night. Participants will be exposed to identical sleep opportunities and living conditions. Using hormone analysis to examine participants' circadian rhythms, researchers will evaluate the biological differences that people undergo during the sleep process. Results from this study may help researchers understand whether sleep duration and sleep needs differ among people because of biological and genetic variations.
Over a period of 4 to 6 weeks, potential study participants will attend 4 to 6 screening visits, which will include a medical history review, physical exam, blood and urine collection, electrocardiogram (EKG) to measure electrical activity of the heart, a psychological assessment, and an overnight stay in a sleep laboratory. For 3 weeks, potential participants will also wear an activity monitor, and they will record sleep habits electronically and in a daily diary.
Participants who are eligible for the study will spend 28 days in the Intensive Physiological Monitoring Unit of the Clinical and Translational Sciences Center at the Brigham and Women's Hospital. Participants will not have access to a clock, radio, television, or computer, and they will not be allowed any outside contact. Most days participants will remain in bed for 10 to 14 hours; however, at selected times during the study, participants will remain inactive for periods of 32 to 64 hours and will stay awake for 32 to 40 hours. Throughout the study, participants' sleep patterns will be monitored continuously by a wrist activity recorder. Heart rhythms, brain electrical activity, eye movements, and temperature will also be measured continuously. At different times throughout the study, participants will undergo urine, saliva, and blood collection; alertness, mood, and performance evaluations; and blood pressure measurements. Upon release from the research center, participants will maintain a sleep diary for 3 weeks.
|Study Type :||Observational|
|Actual Enrollment :||119 participants|
|Official Title:||Neurobiology of Individual Differences in Sleep Duration|
|Study Start Date :||October 2005|
|Actual Primary Completion Date :||November 2011|
|Actual Study Completion Date :||November 2011|
- Circadian rhythm assessment based on plasma melatonin and other hormones; sleep and EEG analysis; measurements of cognitive performance, alertness, and mood [ Time Frame: Measured during the 4-week inpatient stay ]
Biospecimen Retention: Samples Without DNA
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00607204
|United States, Massachusetts|
|Brigham & Women's Hospital|
|Boston, Massachusetts, United States, 02115|
|Principal Investigator:||Daniel Aeschbach, PhD||Brigham & Women's Hospital, Boston, MA|