Effects of Chronic Sleep Restriction in Young and Older People

Aging Clinical Trial

Official title: Sleep, Aging, and Circadian Rhythm Disorders

Status Recruiting

Clinical Trial Summary

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.

Clinical Trial Description

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. ;

Study Design

Allocation: Non-Randomized, Intervention Model: Crossover Assignment, Masking: Open Label

Related Conditions & MeSH terms

• Aging
• Metabolic Syndrome
• Metabolic Syndrome X
• Sleep Deprivation

• NCT number: NCT00506428
• Study type: Interventional
• Source: National Institute on Aging (NIA)
• Status: Recruiting
• Phase: N/A
• Start date: December 2006
• Completion date: June 2011