Regularity & circadian

A wrist wearing a plain black activity band, with the other hand touching it, against a blurred outdoor background.

Choppy rest-activity rhythms linked to more deaths among 3,061 adults with heart, kidney or metabolic risk

Oct 19, 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

A runner on a snow-covered path at dusk, with a lit street lamp and apartment buildings behind.

Evening exercise and sleep: what trials show, and when a late hard workout may cost rest

Oct 2, 2026

A person sitting at a computer in a dark room lit by green and blue light.

Night owls were 1.7 times as likely to retire early on a disability pension in a 12-year Finnish study

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

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 unmade bed beside a large window looking out on lit city buildings

Light at night went with a thicker, stiffer heart, in 11,071 UK Biobank adults with heart scans

Sep 23, 2026

A small spotted mouse sitting inside a tipped-over glass jar

A sparse class of brain cells switched on slow-wave sleep in mice when researchers activated them

Sep 20, 2026

A twin-bell alarm clock on a wooden surface in low, warm early light

Morning people had more heart attacks, not fewer

Aug 14, 2026

A person asleep in bed under warm low light

Melatonin: uses, evidence, dosing and safety

Aug 5, 2026

A pair of hands holding a plate and fork over a wooden table

Irregular meal times tracked anxiety. Irregular sleep did not.

Aug 2, 2026

A woman stretching her arms as she wakes up in bed

Social jet lag tied to 30% more heart disease

Jul 26, 2026

A man lying on his back in bed in a dark room at night

A regular sleep schedule tracked with lower dementia risk

Jul 21, 2026