Sleep is the subject of intense scientific debate among biologists and neuroscientists. Why must we spend about one-third of our lives asleep? What exactly is sleep? Why does a lack of sleep impair our cognitive abilities and leave us vulnerable to a host of medical issues ranging from obesity to reduced resistance to infectious disease? These 24 engrossing lectures take you to the forefront of the field to reveal what happens in the sleeping brain right down to the cellular and molecular level. You'll investigate what biological changes occur during wakefulness that are reversed during sleep - and why your brain forces you to fall asleep to repay an accumulated sleep deficit, no matter how dangerous the circumstances. The science of sleep encompasses basic concepts of electricity, neuroanatomy, and neurochemistry, which are responsible for the "architecture of sleep." Professor Heller explains the science behind our circadian rhythms, REM and non-REM sleep, the physiology of dreaming, and more. Sleep pathologies and disorders are among the most fascinating topics of the course. From disorders such as sleep apnea, narcolepsy, and restless leg syndrome to parasomnias such as sleepwalking and night terrors, the most up-to-date findings in the science of sleep are truly riveting.