Even as we slumber, our industrious brains continue working to keep us alive. They ensure our heartbeats and breathing remain on track, wash off the waste they've accumulated throughout the day, and sort and file our memories. Now it seems they achi
suggesting sensory processing of our environments continues even as we're unconscious, with the brain entering a 'sentinel mode' to perform this processing.
"Our results pose unfamiliar voices as more relevant – or in evolutionary terms potentially more threatening – and consequently more arousing to the sleeper than familiar voices," the teamHowever, the researchers haven't ruled out that this more aroused response isn't just due to new voices being more attention attracting in general, rather than specifically perceived as a possible threat.
Yet, while the response to familiar voices didn't change after repeated exposure later in sleep, the brain's response to unfamiliar voices did. This suggests the brains not only processed but learned from new information during sleep, possibly deciding the unfamiliar but repeated noise was not a threat, dulling future responses to it.
These findings may help explain why we can find it hard to sleep in new environments at first – our brains require time to sort out all the unfamiliar sounds and determine we are indeed safe to remain relaxingly unaware.
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