Humans 'May Need More Sleep in Winter', Study Finds

For those of us who struggle to leave our beds in the winter, taunts of "lazy" could well be misplaced. From a report: New research suggests that while humans do not hibernate, we may need more sleep during the colder months. Analysis of people undergoing sleep studies found that people get more REM (rapid eye movement) sleep in the winter. While total sleep time appeared to be about an hour longer in the winter than the summer, this result was not considered statistically significant. However, REM sleep -- known to be directly linked to the circadian clock, which is affected by changing light -- was 30 minutes longer in the winter than in summer. The research suggests that even in an urban population experiencing disrupted sleep, humans experience longer REM sleep in winter than summer and less deep sleep in autumn. Researchers say if the study's findings can be replicated in people with healthy sleep, this would provide the first evidence for a need to adjust sleep habits to season -- perhaps by going to sleep earlier in the darker and colder months.

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