- Sleep-Related Excessive caffeine consumption ( 5 cups of coffee per day) and unable to reduce to 3 cups before lunch a day for 3 weeks prior to treatment. Subjects will be initially screened by the Berlin Questionnaire (for sleep apnea) and those with responses suggestive of high risk for sleep apnea, will be referred to Pulmonary Medicine for standard clinical screening including polysomnography. Subjects whose sleep apnea is too severe for this project (AHI > 15) will be referred for clinical treatment or other research protocols on sleep apnea. Subjects who have Obstructive Sleep Apnea (OSA) but who are adherent to CPAP will not be excluded. Subjects working a rotating shift or an unconventional daytime shift (ending after 1700 h) will be ineligible.