Each month our editorial team sifts through hundreds of papers and curates notable findings—for practitioners and informed readers who want to stay current with the evidence. Subscribe to the monthly Research Digest for expert analysis and concise summaries of key papers.
This review looked at 41 studies with 92,340 adults to see how sleep timing and day-to-day regularity relate to health. It found that going to bed or waking up later, and having more variable sleep patterns, were generally linked to worse health. Social jetlag was linked to worse health, while…
This study followed 1,926 young adults (age 20–23) in Southern California from 2020 to 2021 to see how cannabis use related to later sleep problems. The researchers found that frequent cannabis use (≥20 days/month) was linked with worse sleep for people without anxiety or depression, but linked with slightly better…
This cross-sectional survey (data collected 1 July–15 December 2022) asked people about brain fog, diet, sleep, mood, and gut symptoms. The study found that people who had COVID-19 — especially those with reinfection — and women reported higher brain fog scores. Gastrointestinal symptoms and mood scores were linked to worse…
