We gain an hour of sleep when Daylight Saving Time (DST) ends, which occurs at 2 a.m. on the first Sunday in November. At that time, clocks are set back one hour, effectively giving an extra hour, often called "falling back." This means the hour between 1 a.m. and 2 a.m. happens twice, so if a person sleeps through that period, they gain an additional hour of sleep that night.

In contrast, when DST begins in the spring (second Sunday in March), the clock is set forward one hour at 2 a.m., resulting in a loss of one hour of sleep, often called "springing forward".