Lecture, three hours. Requisite: course 115. Designed for juniors/seniors. Study of measurement of sleep, comparison of sleep in mammal species and sleep in sub-mammalian species, circadian rhythms and circadian control of sleep, development and aging of sleep, brain anatomical and neurochemical control of sleep, effects of sleep deprivation, sleep in psychiatric disorders, human sleep disorders, and properties of dreams. P/NP or letter grading.