Will all the senses be working (seeing, hearing)?

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Yes, human senses continue to work while we are sleeping. Similarly crewmembers in a Torpor state will continue to be able to feel, hear, and see bright lights in their sleep state. However, typically humans require a very small amount of a mild sedative to suppress the body’s natural shiver response that occurs while undergoing Torpor. This sedative would prevent normal sensory stimulation from affecting the astronauts while in hibernation.