How does a sea cucumber sleep?

Sea cucumbers do not sleep in the same way that many animals do, but they do experience periods of reduced activity. During these times, they may retract their tentacles and become less responsive to external stimuli. Their metabolic rate decreases, allowing them to conserve energy, and they often stay in a burrow or hidden among the substrate for protection. This behavior serves a similar purpose to sleep, helping them to recover and maintain their health.