A vigilant brain circuit makes it possible for sound to jolt deep sleepers awake. Credit: Joe Fox Berlin/Radharc Images/Alamy
How do you hear an alarm if you’re asleep? When a person is awake, the brain’s information-relay centre, known as the thalamus, is largely responsible for sending sound and other external sensory information to the cortex, the region responsible for cognition. But this circuit mostly shuts down during deep sleep.
What happens if you are deaf?
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