Chronotype and seasonal daylight saving

Many countries adopt a daylight-saving time (DST), where the societal clock is adjusted by 1 hour, advancing in spring and delaying in autumn.

​Some studies have assessed the impact of DST on clock entrainment. In a large study of 55,000 participants from Germany, Italy, Switzerland, France, Slovakia, the Netherlands, and Luxembourg, researchers found chronotype-dependent differences in adjustments to DST, especially after the springtime change when clocks are advanced by an hour. Those who were classified as morning types adjusted more readily to the DST than those who were evening types, who had still failed to re-entrain (adjust their mid-point of sleep on free days or center of gravity of activity) within 3 weeks of the time transition.

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