Just a week after Halloween, Daylight Saving Time officially ends in the U.S. and Canada, at 2 a.m. on Sunday, when clocks are moved back one hour.

Daylight Saving Time is a way of getting more light out of the day by advancing clocks by one hour during the summer. The practice allows for more light during the evening hours and less in the morning hours. It was originally introduced to make the most of the weakened winter sun.

Daylight saving time generally begins in March and ends in November in the northern hemisphere, while it starts in the southern hemisphere between Sept-Nov and ends between March-April.

North Americans generally follow the DST procedure, with each time zone switching at 02:00 LST (local standard time) to 03:00 LDT (local daylight time) on the second Sunday in March, and back from 02:00 LDT to 01:00 LST on the first Sunday in November since 2007. Previously, daylight saving time was four to five weeks shorter.

However, not all U.S. states and territories observe the confusing daylight saving time (DST) ritual as the federal government does not compel them to observe DST. The states or territories that do not observe DST are Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands and most of Arizona except for the Navajo Reservation.

From 1987 to 2006, DST in the U.S. began on the first Sunday of April and ended on the last Sunday of October. The time was adjusted at 2:00 a.m. local time.

DST in the U.S. began on the first Sunday of April and ended on the last Sunday of October from 1987 to 2006. However, the Energy Policy Act of 2005 altered the beginning and end dates of daylight savings, starting in 2007. That means DST begins at 2 a.m. in each time zone on the second Sunday of March, instead of the first Sunday of April and ends on the first Sunday of November rather than the last Sunday in October.

Meanwhile, the practice of daylight savings has been criticized and reported to cause problems for farming and other occupations tied to the sun. Many have argued for and against the practice of daylight savings, ever since it was proposed first in 1895 by an astronomer G.V Hudson. Apart from the practical difficulties, many argued that the practice didn't make any sense and was an assault on logic.

It wasn't until World War I that daylight saving time was realized on a global scale. Germany was the first state to adopt the time changes, to reduce artificial lighting and thereby save coal for the war effort.