Eight high-school girls participating in competitive sports and six
non-participating girls living north of the polar circle recorded their sleep
once a week during the Fall, including the period when the sun does not rise
above the horizon. Sleep-quality scores were computed as the sum of answers
identical to a preset “right” answer indicating good sleep-quality. Significant
differences on sleep-quality between the two groups were found, but a
significant influence of amount of daylight or exercise could not be confirmed.
When sleep-quality was ranked during three periods through the Fall, the girls
participating in competitive sports showed a trend of increasing sleep-quality
and the nonparticipants a decreasing one. An explanation based on influence of
exercise thresholds upon sleep-quality is presented.
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