Insufficient sleep during adolescence and risk of multiple sclerosis: results from a Swedish case-control study.

When total sleep duration was considered (mean sleep duration/night during 1 week including both workdays or schooldays and days off), the OR of MS among those with a sleep duration less than 7 hours/night was 1.4 (95% CI 1.1 to 1.8), with a significant trend showing increasing MS risk with decreasing total sleep duration (p=0.04) (not in table).

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