Sleep Health

A University of Manchester study that tracked 89 adults with wearable light sensors and sleep monitors found that brighter, more consistent daytime light exposure predicted earlier bedtimes, earlier waking, and deeper sleep early in the night.

New research presented at the SLEEP 2026 annual meeting finds that shift workers with shift work sleep disorder carry two to three times the rates of hypertension, metabolic syndrome, and major cardiovascular events — a risk burden that persists even after controlling for lifestyle factors.

A JAMA Network Open systematic review warns that melatonin is the leading cause of unsupervised medication exposure in young children, with a 530% rise in pediatric ingestions over a decade — yet long-term safety data remain largely absent.

The National Sleep Foundation has completed a comprehensive 10-year review of its landmark 2015 sleep duration recommendations, analyzing 133 meta-analyses encompassing up to 3,222 individual studies. The verdict: the original guidelines still hold, and the current science does not support different sleep recommendations for men and women.

A University of Arizona study of 23,377 UK Biobank participants found that three modifiable sleep behaviors — short or long sleep, frequent napping, and trouble sleeping — independently predicted greater white matter lesion volume on brain MRI nearly nine years later.

A new study presented at SLEEP 2026 found that 70% of pregnant women expected poor postpartum sleep — and those expectations predicted worse actual sleep quality after delivery, outweighing prior sleep disorders and psychiatric history. Researchers say the findings point to a critical prenatal intervention window around 24 weeks.

A longitudinal study of more than 15,000 children found that those with persistently shorter sleep from infancy through age 7 had roughly double the odds of developing chronic depression between ages 13 and 22, with the inflammatory marker IL-6 partially explaining the link.

A Penn State study of 1,741 adults finds excessive daytime sleepiness is tied to 74% higher odds of developing hypertension, and adding prolonged sleep-onset latency more than triples the risk — identifying a distinct high-risk subgroup.

A study of 442 adults presented at SLEEP 2026 reveals that night owls experience more anxiety than early risers — but the relationship disappears once nocturnal loneliness is accounted for, suggesting that the isolation of late-night hours, not the biology of being a night owl, drives the mental health toll.

Night shift workers taking 3 mg of melatonin before daytime sleep showed 80% higher levels of a DNA repair biomarker than those taking a placebo, according to the first randomized trial of its kind.

A Pediatrics study of 401,000 U.S. students found that teen sleep has hit a 30-year low, with just 22% of 18- and 19-year-olds getting seven or more hours per night. Racial and socioeconomic disparities in sleep duration have grown significantly since the early 1990s.

A meta-analysis of 35 studies involving 887 participants found that a single night of poor or missed sleep does not raise inflammatory markers, but three or more consecutive nights of roughly four hours of sleep significantly increases interleukin-6 and C-reactive protein levels in the blood.

A massive Nature study using 23 biological aging clocks found that both short and long sleep accelerate aging across the brain, heart, lungs, and immune system, with the optimal window varying by organ and sex.

A study of 3,231 Finnish adults tracked over a decade found that people with highly irregular bedtimes faced roughly twice the risk of heart attack or stroke — but only if they also slept less than eight hours. Wake-up time variability showed no link to cardiac events.

A randomized trial of 78 early-morning shift workers found that solriamfetol significantly improved alertness, work performance, and daily functioning — the first time any treatment has been tested for this common but overlooked form of shift work disorder.

A 2024 laboratory study found undisclosed pharmaceuticals, an herbicide, and industrial chemicals in commercially sold melatonin vapes. One device appeared to contain no melatonin at all. Federal regulators have known this product category exists for years. No enforcement action has been taken against any of the major brands currently on the market.

A prospective study of 85,618 UK Biobank participants finds that people who naturally rebound after short sleep have lower mortality risk than those who do not — and that severe restriction without recovery raises death risk by up to 38%.

A Mass General Brigham study tracking 1,338 older adults for up to 19 years found that frequent napping, particularly in the morning, was associated with significantly higher mortality risk.

UC Berkeley researchers have mapped the brain circuits that control growth hormone release during sleep, revealing a feedback system that explains the links between poor sleep and metabolic disease — and opening new avenues for treatment.

A global study of Samsung Health users released for World Sleep Day found that 23% of participants showed signs of sleep apnea risk, with the condition silently robbing sufferers of deep sleep and REM sleep every night.

A new study from Oregon Health & Science University found that regularly getting less than seven hours of sleep is more strongly associated with shorter lifespan than poor diet, lack of exercise or social isolation.

The latest generation of sleep technology moves beyond wristbands to capture data you never knew you needed.