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sleep

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

Life

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

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

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An oddly coloured landscape

Humans

The dreams you forget are the most important for learning

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Think you're fully alert? You can't always tell if you're tired

Humans

Think you're fully alert? You can't always tell if you're tired

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A person in bed with a mobile phone

Health

Getting just 6 hours of sleep is linked to mental health issues

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A person pressing snooze on their alarm clock

Health

Struggle to get up in the morning? You’re at risk of early death

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Protein deposits in the brain

Health

One bad night’s sleep may increase levels of Alzheimer’s protein

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Neanderthals ambushed cave bears as they awoke from hibernation

Life

Neanderthals ambushed cave bears as they awoke from hibernation

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A man sleeping

Health

Calorie restriction may extend lifespan by changing your sleep

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Dreams decoded: 6 answers to the mysteries of the sleeping mind

Humans

Dreams decoded: 6 answers to the mysteries of the sleeping mind

Features

Man trying to sleep

Health

We must all wake up to the need for a good lie-in at the weekend

Without more of the dream-dense morning sleep that is so important for our brains and health, we risk sleepwalking our way to problems

Leader

Life

Why dreaming is vital: Unlocking the power of REM sleep

Features

Life

5 ways to boost your dreams and improve your health

Features

Health

We’ve evolved to sleep less and that may be causing Alzheimer’s

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Life

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

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