{
  "abstract": "What is a chronotherapeutic approach? We know that limiting evening light can move the circadian clock earlier and facilitate earlier sleep timing and short-wavelength blue-green light seems to have the greatest impact on the circadian clock. Westcott DL et al (JAMA Pediatr 2026 doi: 10.1001/jamapediatrics.2026.0976) have developed a programme of sleep scheduling, wearing morning bright-light glasses and evening blue light-blocking glasses and run a randomised controlled study of 80 individuals aged 16–19 years from an academic medical centre during school months between late August and mid-June. Entry criteria were those who reported habitual weekend sleep onset later than 01:00 hours. The Sleeping Late Teens Programme was the intervention and simple sleep monitoring was the control group. The intervention was one collaborative problem-solving session (<1 hour) followed by 2 weeks of a personalised sleep schedule that shifted bedtimes and wake times earlier. Participants wore morning bright-light glasses for 30–60 min on waking and amber-tinted blue light-blocking glasses for 2 hours before bed. They measured weeknight circadian timing indexed by salivary dim-light melatonin onset (DLMO), weeknight sleep duration measured with actigraphy and circadian alignment operationalised as the interval between DLMO and midsleep (middle of the nocturnal sleep period). In the 86 participants, 44 were randomly assigned to the intervention group and 42 to the control group. Of these, 80 completed baseline procedures (40 in each group): mean (SD) age, 17.5 (0.7) years; 48 females (60%). The intervention group showed statistically significant and clinically relevant changes in sleep and circadian metrics compared with the sleep monitoring control. After 2 weeks, participants randomised to the active intervention, compared with the control, had earlier circadian timing and longer weeknight sleep duration. DLMO-midsleep alignment shortened by 18 min in the intervention group compared with an 8 min lengthening in controls; however, this difference was not statistically significant. Great results. Lucina is looking forward to the larger more longer-term studies.",
  "authors": [
    {
      "affiliations": [],
      "name": "BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health"
    }
  ],
  "title": "Highlights from the literature",
  "uid": "7d3c68dc-29ea-5e71-9c2d-7ada5534e2e7"
}