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Seals only sleep with half their brain when they're out at sea

Seals only sleep with half their brain when they're out at sea

7 June 2018

Northern fur seals mostly sleep with half their brain while they’re at sea, but sleep with all their brain while on land – unlike any other animal studied
Birds 'dream sing' by moving their vocal muscles in their sleep

Birds 'dream sing' by moving their vocal muscles in their sleep

9 February 2018

Zebra finches sing during the day, and at night while they sleep their vocal organs act out the motions of singing, a bit like a sleepwalking person

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