On Sleep and Sleeplessness (Unabridged‪)‬

Aristotle’s writings cover many subjects, including aesthetics, biology, metaphysics, logic, ethics, poetry, theater, music, rhetoric, linguistics, politics and government. They constitute the first comprehensive system of Western philosophy. "On Sleep and Sleeplessness" attempts to explain the reasons for sleeping. He argues that sleep and wakefulness are both affections of the activity of the primary faculty of sense-perception.