Lethargy - Definition

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Lethargy is a state of deep and prolonged sleep during which many bodily functions are still present and functional, but slowed. It is usually accompanied by a total lack of muscle or verbal response.

Lethargy usually presents no associated symptoms or disease that can explain it. In cases of sudden wakening, the patient falls back asleep almost instantly and preserves no memory of their waking phase. It is currently attached to psychiatric distress, especially in some people suffering from a state of hysteria.