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Daylight-saving time ends at 2 a.m. on Sunday, November 3.

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Brian Snyder/Reuters

in the US ends on Sunday, November 3, 2019 at 2 a.m.

That morning, most phones and computers will automatically fall back one hour, and we’ll gain an hour of sleep.

The interruption can kill people: Incidents of heart attacks, strokes, and fatal car accidents all spike around the start of daylight-saving time each year.

Daylight-saving time is a killer.

The annual ritual in which we “gain” an hour of sleep each November by pushing the clocks backwards may seem like a harmless shift.

But each March, on the Monday after the springtime lurch forward, hospitals report a 24% spike in heart-attack visits around the US.

Just a coincidence? Probably not. Doctors see an opposite trend in the fall: The day after we turn back the clocks, heart attack visits drop 21% as many people enjoy a little extra pillow time.

“That’s how fragile and susceptible your body is to even just one hour of lost sleep,” sleep expert Matthew Walker, author of “How We Sleep,” previously told Business Insider.