Tag
Sleep duration
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Sleep problems worsened years before a psychiatric diagnosis in working-age Swedes and partly eased after it
Karolinska Institutet and Stockholm University researchers matched eight years of sleep surveys from about 25,000 Swedes to health registers. Mental fatigue had the strongest link to a later diagnosis, yet fewer than 3 in 100 got one.
Sep 14, 2026
One all-nighter hit driving harder than four short nights
A trial in SLEEP put the same 20 men through a night with no sleep, four nights of two hours less, and normal sleep, then a simulated dawn commute. The all-nighter degraded lane control within minutes. The gradual loss barely showed.
Aug 9, 2026
Insomnia tracked death risk only when sleep was measured
In the Wisconsin Sleep Cohort, 767 adults were followed for a median of eight years. Insomnia with under six hours on an overnight recording carried 2.6 times the risk of dying. Insomnia with self-reported short sleep carried none.
Aug 8, 2026
Short and long sleep both tracked with Alzheimer changes
Using brain scans from 38,816 UK Biobank participants, researchers found a U-shaped pattern: five to six hours and nine to ten hours both lined up with more Alzheimer-like shrinkage and worse test scores.
Aug 4, 2026