Unfamiliar voices seem to put the sleeping brain on alert in a way that familiar voices don’t
The sleeping brain is more active if it hears unfamiliar voices rather than familiar ones. The finding suggests that we can process information about our environments even in the depths of sleep.
In either case, the voice repeatedly uttered three first names: two random but common names and the name of the sleeper. The audio recordings were played for four 90-minute periods during the night. There was a 30-minute gap between each audio recording so that it would be easier for people to stay asleep.
If the participant’s brain activity suggested that they were on the verge of waking up, the researchers lowered the volume of the recordings to help them stay asleep. at the University of Oxford. “We see these effects when hospital patients find it very hard to sleep.”
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