November 2, 2025 (at 2:00 a.m. local time) marks the end of Daylight Saving Time (DST) in the U.S. Clocks “fall back” one hour, reverting to standard time and giving millions of appreciative Americans an extra hour of sleep. Europeans turned back their clocks on October 26.

Globally, Europe and the U.S. are outliers—most countries in the world do not use DST. The practice has always been highly unpopular with farmers, in particular, and in recent years, medical organizations like the American Academy of Sleep Medicine (AASM) have chimed in, arguing that it needs to be abolished due to adverse impacts on circadian biology.

Although the AASM’s primary objection to DST has to do with acute health-related effects—including increases in sleep disruption, mood disturbances, suicide, and traffic accidents—the organization also notes:

“On the Monday after the transition to DST [in the spring], volatility in stock markets in the U.S. has been observed…. [P]roposed mechanisms include the impact of sleep deprivation on frontal lobe functioning, which may result in impaired judgement and decision-making capacity.”

States can opt out of observing DST. Currently, two states (Hawaii and most of Arizona) and five U.S. territories (American Samoa, Guam, Northern Mariana Islands, the U.S. Virgin Islands, and Puerto Rico) don’t practice DST, and a handful of other states have shown interest in getting rid of the twice-a-year time changes, although opinions are split on whether to make DST or standard time the permanent status quo.

Americans who are opposed to the Sunshine Protection Act or similar actions at the state level can let their legislators at both the federal and state levels know that they support a change to permanent standard time, which aligns best with the natural circadian cycle.