永久夏令时：美国众议院历史性投票，要不要永远不再调表？

A small thing almost everyone has been through has stirred up quite a debate in America lately: should we stop changing the clocks forever?

First, some background.

Changing the clocks twice a year is called "daylight saving time." It appeared over a century ago, originally to make more use of summer daylight and, along the way, save some energy.

It sounds reasonable, but the problem is that the human body does not like being "wound forward" like this.

Each clock change is like forcibly throwing the body clock into disarray.

Studies find again and again that in the days after the switch, the numbers for heart attacks, strokes, and car crashes all show a small spike.

Add in the fact that many people already do not get enough sleep, and being jolted twice a year only piles up more resentment.

So "stop changing the clocks" has become one of the rare topics both parties can nod along to.

Just days ago came a historic step: the U.S. House brought it to a formal vote for the first time and passed it, 308 to 117.

Even the White House openly backed it.

It sounds like "no more changing the clocks" is about to become reality.

But the truly thorny part is the next question: if you stop changing them, which time do you lock in?

This bill picks "permanent daylight saving time" — using the summer setting all year round.

The upside is that it gets dark later in the evening, with plenty of daylight after work to go out for a walk.

But the price is that winter mornings would be especially dark.

Kids would wait for the school bus in the dark and adults would drive to work in the dark, which is actually more dangerous.

Interestingly, most sleep experts are on the other side.

They argue the healthiest choice is to keep "standard winter time" year-round, because that sits closest to the sun and best matches the body clock.

So you get a very awkward standoff: almost everyone agrees to "stop changing it," but the moment you ask "which time to settle on," it erupts into an argument again.

That is exactly why such a seemingly simple thing has stayed stuck for decades, never getting resolved.

Next, the bill still has to get through the Senate.

In the end, "whether to move that one hour" looks like a technical question, but what it really tests is what a society wants most among health, habit, and lifestyle.