Your ears still receive while you sleep, but your brain filters out low-priority sounds – you’re more likely to wake if you hear your own name than a random word, for example. Especially loud snores can wake up a snorer, but only partially, and they’ll usually go right back to sleep almost immediately. Brainwave research suggests that even non-snorers have 20 to 25 of these ‘microarousals’ per hour that they don’t remember in the morning.

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luis villazon
Luis VillazonQ&A expert

Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.

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