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This Sunday, the U.S. is scheduled to set the clocks back – leaving us with an additional hour of daylight in the early morning, and one hour fewer in the afternoon. It marks the end of daylight saving time, (DST) which began in March.
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When we set the clocks back in the fall, we get to do an entire hour of sleep all over again, in theory.
A 2013 review paper notes that there is "little evidence" that people actually get more sleep that night.
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A 2012 study of 120 people found that short sleepers, people who slept less than 7.5 hours, actually got about 20 more minutes of sleep in the days following the autumn time change. But that sleep tended to be heavily disrupted.
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"The transition to standard time is likely to be associated with a negative psychological effect as it very clearly marks the coming of a period of long, dark, and cold days."
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In a 2008 study on 50 people, scientists found that our circadian rhythms tend to align with dawn under standard time (the time we will enter this Sunday).
But when DST was enacted in the spring, some people's internal clocks never fully adjusted.