Tag
Sleep duration
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Longer sleep steadied next-day blood sugar in teenagers
A SLEEP study paired wrist trackers with continuous glucose monitors across 2,245 days in 206 Danish 18-year-olds and found sleep and glucose pushing on each other in both directions.
Jul 29, 2026
Getting a phone at 13 cost sleep, not mood
A JAMA Pediatrics study followed 1,959 teenagers from age 13 to 14 and found that getting a smartphone tracked with less sleep, while depression and obesity tracked with how much it was used.
Jul 28, 2026
Sleep of 7 hours tracked 30% lower death risk by watch and 14% by self-report
Everyone is told to get seven hours, advice built from questionnaires. Following 76,811 UK adults who both wore a tracker and estimated their own sleep, the healthiest amount and the size of the benefit each shifted with the method.
Jul 25, 2026
Bedtime procrastination cost students 1.4 hours of sleep
Researchers wired a residential college with Bluetooth beacons and sleep watches for two weeks and found students who delayed bedtime to socialize slept 1.4 hours less and felt worse the next day.
Jul 25, 2026