Circadian Regulation of Sleep in Habitual Short Sleepers and Long Sleepers

Sleep Disorders Clinical Trial

Official title:

Circadian Regulation of Sleep in Habitual Short Sleepers and Long Sleepers

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00001546
• Other study ID #: 960087
• Secondary ID: 96-M-0087
• Status: Completed
• Phase: N/A
• First received: November 3, 1999
• Last updated: March 3, 2008
• Start date: May 1996
• Est. completion date: June 2000

Study information

• Verified date: April 1999
• Source: National Institutes of Health Clinical Center (CC)
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Federal Government
• Study type: Observational

Clinical Trial Summary

Routine sleep duration varies greatly among individuals. The biological meaning of this variation is unknown.

The term circadian rhythm refers to the biological clock that regulates the timing of falling asleep, waking up, and secretion of hormones, like melatonin. Melatonin is secreted at night. Previous studies have shown that melatonin may play a role in the regulation of sleep.

The purpose of this study is to learn whether the duration of nighttime (nocturnal) melatonin secretion is longer in people with long regular sleep duration than people with short sleep duration.

Researchers will compare levels of melatonin and cortisol, body temperature, sleepiness, and sleep in two extreme groups. Group one will be made up of people with short sleep duration lasting less than 6 hours. Group two will be made up of people with long sleep duration lasting more than 9 hours.

Description:

Habitual sleep duration varies greatly among individuals. The biological meaning of this variation is unknown. The present project proposes that differences in habitual sleep duration are associated with differences in the output of the endogenous circadian pacemaker, which programs the 'internal biological night'. The protocol hypothesizes that the duration of the internal biological night as defined by the nocturnal intervals of detectable plasma melatonin levels, low body temperature, low EEG activity in the high-frequency alpha band, increasing sleepiness and increasing plasma cortisol levels is longer in habitual long sleepers (sleep duration greater than 9 hours) than in short sleepers (less than 6 hours). Since recent results in healthy subjects suggest that melatonin has some soporific or hypnotic properties, we furthermore hypothesize that the level of nocturnal melatonin secretion is higher in long sleepers than in short sleepers. The circadian rhythms of plasma melatonin, body temperature, waking EEG activity, subjective sleepiness and plasma cortisol will be assessed in a ~40-hour constant routine protocol. In addition, a 36-hour extended bed rest protocol will be carried out in order to study spontaneous sleep duration and sleep structure under ad lib conditions while time cues and social cues are absent. It is hypothesized that as a consequence of differences in the circadian output, long sleepers will sleep more, have a different sleep structure, and spontaneously wake up on a lower level of homeostatic sleep pressure than short sleepers. Finally, we intend to determine whether differences in habitual sleep duration between long and short sleepers are associated with dysthymic and hypomanic characteristics of mood, respectively. We are asking to study a total of 15 long sleepers and 15 short sleepers. Given that we have already studied 9 long sleepers and 9 short sleepers, we anticipate that 72 patient-days per year for one year would be required to complete the study.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 38
• Est. completion date: June 2000
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Both
• Age group: N/A and older

Eligibility

Sleep greater than or equal to 9 hours almost every night.

Sleep less than or equal to 6 hours almost every night.

Between ages 20-30.

No medications, history of psychiatric illness, history of head injury.

No sleep disturbances.

Study Design

N/A

Related Conditions & MeSH terms

• Parasomnias
• Sleep Disorders

Locations

Country	Name	City	State
United States	National Institute of Mental Health (NIMH)	Bethesda	Maryland

Sponsors (1)

Lead Sponsor	Collaborator
National Institute of Mental Health (NIMH)

Country where clinical trial is conducted

United States, 

References & Publications (3)

Aeschbach D, Cajochen C, Landolt H, Borbély AA. Homeostatic sleep regulation in habitual short sleepers and long sleepers. Am J Physiol. 1996 Jan;270(1 Pt 2):R41-53. — View Citation

Borbély AA, Baumann F, Brandeis D, Strauch I, Lehmann D. Sleep deprivation: effect on sleep stages and EEG power density in man. Electroencephalogr Clin Neurophysiol. 1981 May;51(5):483-95. — View Citation

Borbély AA. A two process model of sleep regulation. Hum Neurobiol. 1982;1(3):195-204. — View Citation