Analysis of patients undergoing sleep studies finds that people get more REM sleep in the winter. Whether we’re night owls or morning larks, our body clocks are set by the sun. Theoretically, changing day length and light exposure over the course of the year could affect the duration and quality
that analyzed people in urban areas who experience disrupted sleep, humans have longer REM sleep in winter compared to summer, and less deep sleep in autumn.Whether we’re night owls or morning larks, our body clocks are set by the sun. Theoretically, changing day length and light exposure over the course of the year could affect the duration and quality of our sleep. But figuring out how this applies in practice is difficult.
“Possibly one of the most precious achievements in human evolution is an almost invisibility of seasonality on the behavioral level,” said Dr Dieter Kunz, corresponding author of the study, based at the Clinic of Sleep & Chronomedicine at the St Hedwig Hospital, Berlin. “In our study we show that human sleep architecture varies substantially across seasons in an adult population living in an urban environment.”A team of scientists led by Ms. Aileen Seidler in Dr.
The team excluded patients who were taking medications known to affect sleep, technical failures during the polysomnography, and REM sleep latency longer than 120 minutes, which suggested that the first REM sleep episode had been skipped. Once these exclusions had been made, 188 patients remained. Most of their diagnoses showed no seasonal pattern, but insomnia was more commonly diagnosed towards the end of the year.
“Seasonality is ubiquitous in any living being on this planet,” said Kunz. “Even though we still perform unchanged, over the winter human physiology is down-regulated, with a sensation of ‘running-on-empty’ in February or March. In general, societies need to adjust sleep habits including length and timing to season, or adjust school and working schedules to seasonal sleep needs.”
Reference: “Seasonality of human sleep: Polysomnographic data of a neuropsychiatric sleep clinic” by Aileen Seidler, Katy Sarah Weihrich, Frederik Bes, Jan de Zeeuw and Dieter Kunz, 17 February 2023,
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