Sleep duration

A person asleep under a blue duvet with only the top of the head showing against the pillows.

Sleeping nine hours or more tracked with a 17% higher death rate over 30 years in Taiwan

Oct 20, 2026

A person in red pajamas and a patterned sleep mask asleep in a bed with white covers in a bright, sunlit room.

People who slept in on weekends after short weekday nights died at the same rate as steady sleepers

Oct 4, 2026

A car with its headlights on driving along a curving road in thick fog.

Daylight saving time: fatal morning crashes rose 26% after the spring change, but the daily total held steady

Oct 2, 2026

Three road workers in orange high-visibility clothing and hard hats standing at a work site at night.

Shift work and health: what studies show for the heart, diabetes and sleep, and what remains unclear

Oct 2, 2026

An older woman with white hair asleep on a bed, hugging a striped pillow.

Short, irregular and broken sleep were each linked to more osteoporosis in 63,083 UK adults

Oct 2, 2026

A mug of dark drink beside a lit tablet, a small lamp and a pair of glasses on a wooden table at night.

Caffeine and sleep: how much sleep coffee costs, how long the effect lasts and why people differ

Oct 1, 2026

A person with short dark hair, seen from behind, looking at an abstract blue painting on a white gallery wall.

Sleep loss made paintings look less beautiful to 68 young adults in a lab experiment

Oct 1, 2026

A person tapping a smartwatch with a blank screen worn on the wrist.

Sleep trackers: how accurate they are, what they miss and what sleep doctors say about them

Oct 1, 2026

A person asleep in bed behind a black alarm clock.

How much sleep do adults need? What the research and guidelines say

Sep 29, 2026

An older man napping on a sofa under a blanket, with a glass of water in the foreground.

Are naps good for you? What the research on daytime napping shows

Sep 29, 2026

An older couple dozing on a sofa under a knitted blanket, a television remote still in hand

Naps of 30 to 60 minutes went with the lowest odds of cognitive impairment in 7,480 older adults

Sep 21, 2026

A man asleep on his side in bed in soft morning light

More REM and deep sleep tracked with lower risk of dozens of diseases in 95,559 people

Sep 18, 2026

A woman sitting up awake in bed at night under blue light, a lamp glowing on the nightstand

Sleep problems worsened years before a psychiatric diagnosis in working-age Swedes and partly eased after it

Sep 14, 2026

The view through a windshield of a multi-lane road at dusk, with red tail lights streaking ahead

One all-nighter hit driving harder than four short nights

Aug 9, 2026

A person lying awake in a dark bedroom beside a clock reading 4:56

Insomnia tracked death risk only when sleep was measured

Aug 8, 2026

An alarm clock on a stack of books beside an unmade bed in a dim room

Short and long sleep both tracked with Alzheimer changes

Aug 4, 2026

A young man asleep on his back in bed

Longer sleep steadied next-day blood sugar in teenagers

Jul 29, 2026

A teenager lit by a phone screen in a dark bedroom

Getting a phone at 13 cost sleep, not mood

Jul 28, 2026

A person tapping a blank-screened smartwatch worn on their wrist

Sleep of 7 hours tracked 30% lower death risk by watch and 14% by self-report

Jul 25, 2026

Three friends talking in a brightly lit kitchen late at night, seen through a doorway

Bedtime procrastination cost students 1.4 hours of sleep

Jul 25, 2026

A woman asleep in bed in a softly lit bedroom

Losing 80 minutes of sleep a night led to weight gain

Jul 22, 2026