This Sunday, Nov. 3, at 2 a.m. Daylight Saving Time ends so make sure you set your clocks back by one hour before bedtime for the next day in order to resume activities with the new schedule. Although this Sunday concludes the 2013 Summer schedule, the federal government doesn't require U.S. states or territories to observe Daylight Saving Time, which is why residents of Arizona (except for residents of the Navajo Indian Reservation), Hawaii, Puerto Rico, the Virgin Islands, American Samoa, Guam, and the Northern Marianas Islands won't need to change their clocks this weekend, according to a recent report from National Geographic.
As Wikipedia explains, "the modern idea of daylight saving was first proposed in 1895 by George Vernon Hudson and it was first implemented by Germany and Austria-Hungary starting on 30 April 1916. Many countries have used it at various times since then. Much of the United States used DST in the 1950s and 1960s, and DST use expanded following the 1970s energy crisis. It has been widely used in North America and Europe since then."
In Baja California, Daylight Saving Time has been in place since 1942 and in the Yucatan Peninsula since 1981. Globally, the first implementation of Daylight Saving Time was in 1916, during the First World War, and is currently used in more than 80 countries.
According to various studies and considerations from the National Institute of Neurology and Neurosurgery, the human body takes up to 72 hours to adjust to schedule changes; sometimes up to a week in cases of extreme sensitivity.
NINN points out that among the groups most affected are children and senior citizens, because they have a higher number of sleep disturbances.