12a. DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release, distribution is unlimited 12b. DISTRIBUTION CODE ABSTRACT (maximum 200 words)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 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 eighthour sleep regimen using standardized test scores as a performance measure. One year of data with the eight-hour sleep regimen was 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 is less than one in ten million. Recruits an additional two hours of sleep per night. This latest modification was selected to coincide with the acknowledged adolescent/young adult circadian rhythms. NUMBER OF PAGES 111 SUBJECT TERMSThe 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.

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