Sleepiness Versus Sleeplessness: Shift Work and Sleep Disorders.

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Thomas Roth, Ph.D., began the meeting by stating that the need for sleep is a basic physiologic drive in humans, but sleep itself is fragile and not fully understood. Dr. Roth went on to describe the processes of normal sleep. Three processes are thought to regulate sleep and wakefulness: a homeostatic process, a circadian process, and an ultradian process.