Effects of Chronic Sleep Restriction in Young and Older People

Study Overview
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Brief Summary
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The purpose of this study is to examine the consequences of chronic sleep restriction on nighttime sleep, daytime alertness, performance and memory functions, and metabolic and cardiovascular function, and to determine if the consequences of chronic sleep restriction differ between healthy young and older adults.

Detailed Description
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It has long been recognized that sleep patterns change with age. A common feature of aging is the advance of the timing of sleep to earlier hours, often earlier than desired. Polysomnographically-recorded sleep in older people shows an increased number of awakenings, a reduction of stages 3 and 4 (SWS) sleep, and a flattening of REM sleep distribution throughout the night. These age-related changes are found in even healthy individuals who are not taking medications and who are free from sleep disorders. In addition to these sleep disturbances, many older individuals curtail their sleep voluntarily, reporting similar rates of sleep restriction (sleeping less than 7 or less than 6 hours per night) as young adults. Whether voluntary or not, insufficient sleep has medical, safety and metabolic consequences. In fact, converging evidence in young adults suggests that sleep restriction per se may impair metabolism, and that reduced sleep duration is associated with weight gain, obesity, diabetes, cardiovascular disease, and mortality. The study begins with 21 days of outpatient study in which the participants will be required to sleep for 10 hours each night in order to ensure they are well-rested. This will be followed by a 39-day inpatient study. The study will begin with 3 sleep satiation days during which all participants will be scheduled to sleep for 12 hours per night and have a 4 hour nap each afternoon. This is followed by 3 baseline days in which the participants will follow the same sleep-wake schedule they were following at home. Following this, the participant will undergo 3 weeks of chronic sleep restriction while living on a non-24-hour schedule. The participant will live on a schedule that is equivalent to 5.6 hours of sleep per 24 hours. Following these 3 weeks, the participant will be scheduled to again sleep for 10 hours per night for 10 nights.

Official Title
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Sleep, Aging, and Circadian Rhythm Disorders

Conditions
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Aging, Sleep Deprivation, Metabolic Syndrome

Intervention / Treatment
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* Behavioral: chronic sleep restriction


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy Exclusion Criteria: Chronic or acute medical condition Medication use Depression History of psychiatric illness Sleep disorder

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Allocation: Non-Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Intervention/Treatment |
| --- |
|Behavioral: chronic sleep restriction|5.6 hours of sleep per 24 hours for 3 weeks|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Changes in sleep and waking EEG measures |  | During 3-week chronic sleep restriction segment of inpatient study | 
| frequent measures of performance, attention, alertness, and memory |  | During 3-week chronic sleep restriction segment of inpatient study | 
| measures of cardiovascular and metabolic function |  | During 3-week chronic sleep restriction segment of inpatient study | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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aging, sleep, sleep deprivation, performance, memory, metabolism