No description available.

No description available.

No description available.

Thesis (M.S.)--University of Michigan, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

published_or_final_version / Social Work / Master / Master of Social Work

No description available.

Approved for public release, distribution unlimited / The purpose of this thesis is to analyze data related to sleep patterns of warfighters deployed to the Southwest Asia (SWA) Area of Operation. To this end, we collected subjective survey data from warfighters operating in Iraq and Kuwait from 25 August - 15 October 2003 (n = 273). Participants were asked about unit-level sleep planning, sleep/wake patterns, and lifestyle factors. Using the survey results, we are able to gain insight regarding the four primary research questions: 1) Is sleep deprivation a significant problem for forces in the SWA region; 2) Do current sleep logistics support a unit's ability to accomplish assigned missions; 3) Are there differences in sleep patterns between subset populations; and 4) Does the current survey method support the research objectives. To address these questions, we used analysis techniques such as principal components analysis, factor analysis, and parametric and nonparametric hypothesis testing. We tested the reliability of the subjective survey results by comparing self-reported survey data with actigraphy data corresponding to the same time period (n = 34 paired observations). This thesis also provides insight regarding the use of sleep logistics as a force multiplier during continuous/sustained operations by discussing known fatigue countermeasures and their role in improving individual and unit performance effectiveness.

Approved for public release; distribution is unlimited / Fatigue due to sleep deprivation is a major factor in both mental and physical performance. Failure of Recruits to receive the proper quality and quantity of sleep can be detrimental to a Recruit’s safety and can diminish the amount of information learned during training. During the 1980s, the sleep regimen was decreased to 6 hours of sleep per night. In 2002, a decision was made to give U.S. Navy Recruits an additional two hours of sleep per night. This latest modification was selected to coincide with the acknowledged adolescent/young adult circadian rhythms. The purpose of this study was to determine the impact of the new eight-hour sleep regimen using standardized test scores as a performance measure. One year of data with the eight-hour sleep regimen is compared to two separate years when only six hours of sleep was allowed. There is a significant difference, F(2, 33) = 29.82, p < .0001, between the test scores of Recruits receiving 6-hours of sleep and 8-hours of sleep. On average test scores rose by 11 percent with the additional sleep. The odds of observing such a difference by chance is less than one in ten million. / Lieutenant Commander, United States Navy

Human Systems Integration Report / This study examined the effects of noise, temperature, humidity, motion and light on the sleep patterns of the crew of the HSV-2 SWIFT during Gulf of Mexico Exercise (GOMEX) 05-1. HSV-2 SWIFT was chosen for this study to examine crew sleep on an unconventional hull type manned with a small crew. Noise dosimeters, temperature and humidity monitors, actiwatches and questionnaires were used to quantify the data. With the exception of light, the independent variables did not have significant effect upon participant sleep. This is likely due to the limited range of the independent variables and the small number of participants in this study. There were two findings in this study; the relationship between the demographic variable sea time and participant sleep and the relationship between the independent variable light and participant sleep. Due to the limitations in the current study, it is recommended that further studies be conducted in more extreme operational environments. Additionally, studies such as the one discussed in this thesis, should be completed on different platforms to determine the differences in environmental factors that affect sleep between hull types so that the results can be applied to future vessel design.