Regularity & circadian
Morning people had more heart attacks, not fewer
In 4,578 adults from the Sleep Heart Health Study followed for a decade, both morning and evening types had higher rates of heart attack than the people in between. The pattern sat almost entirely in those with sleep apnea.
Aug 14, 2026
Melatonin: uses, evidence, dosing and safety
Melatonin shifts the body clock rather than causing sleep, which is why it works well for jet lag and badly for ordinary insomnia. In adults it cuts time-to-sleep by about five minutes.
Aug 5, 2026
Irregular meal times tracked anxiety. Irregular sleep did not.
In 2,945 French-speaking adults, the gap between weekday and weekend eating schedules was linked to anxiety, depression and insomnia. Sleep timing showed nothing.
Aug 2, 2026
Social jet lag tied to 30% more heart disease
A Journal of Internal Medicine study tracked sleep timing in 51,562 UK adults and found those whose weekend sleep shifted two hours or more had 30% higher heart disease risk, whatever their sleep duration.
Jul 26, 2026
A regular sleep schedule tracked with lower dementia risk
A week of wrist-monitor sleep in 82,391 UK adults showed that those with the most regular schedules were less likely to develop dementia, and a steady rhythm seemed to offset sleeping too little. It shows a link, not proof.
Jul 21, 2026