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Can an earthquake wake you up?

Farther from the epicenter, the impact was weaker and more people slept through the shaking. In San Francisco and Oakland, slightly more than half (55%) woke up.

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The largest earthquake to hit California’s Napa Valley in 25 years struck near the Bay Area early Sunday morning. The 6.0-magnitude quake hit at 3:20 a.m. local time near American Canyon, about 6 miles southwest of Napa, at a depth of 6.7 miles. Nearly 90 people were injured—and countless more woken up, disturbed, and generally freaked out. Thanks to the quantified self phenomenon—the always-on activity and sleep trackers many people now wear—we know more than ever about the psychic effects of such an event. Jawbone, the San Francisco-based maker of fitness trackers, analyzed data from its users to see how the quake affected sleep across the Bay Area. The company’s UP device is a slinky bracelet that monitors movements and sleep. Here’s what Jawbone found: Napa, Sonoma, Vallejo, and Fairfield were less than 15 miles from the epicenter. Almost all (93%) of the UP wearers in these cities suddenly woke up at 3:20AM when the quake struck. Farther from the epicenter, the impact was weaker and more people slept through the shaking. In San Francisco and Oakland, slightly more than half (55%) woke up. As we look even farther, the effect becomes progressively weaker—almost no UP wearers in Modesto and Santa Cruz (and others between 75 and 100 miles from the epicenter) were woken up by the earthquake, according to UP data. Perhaps not surprisingly, once awoken, residents near the quake took a long time to get back to sleep. According to the company’s data, “45% of UP wearers less than 15 miles from the epicenter stayed up the rest of the night.” The visualization below, provided by Jawbone’s senior data scientist Brian Wilt, shows sleep changes based on proximity from the epicenter. The company says the results of its study are statistically significant.

Jawbone

[Jawbone]

Contact us at letters@time.com.

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What to do in earthquake at home?

If an earthquake strikes and you are indoors: Get under a sturdy table or desk and DROP, COVER and HOLD. Staying in one safe place during the shaking will help you avoid being hit by falling objects and from tripping or falling. Stay inside until the shaking stops – wait for any aftershocks.

No matter where you are when an earthquake happens, it is important to follow the advice of emergency services, stay calm, watch for hazards and help others if possible.

If an earthquake strikes and you are indoors:

Protect yourself

Stay away from glass, windows, outside doors, walls, and anything that could fall, such as fans, light fixtures or furniture

Get under a sturdy table or desk and DROP, COVER and HOLD

Staying in one safe place during the shaking will help you avoid being hit by falling objects and from tripping or falling

Stay inside until the shaking stops – wait for any aftershocks

Do not use matches, candles or any kind of flame, as there may be leaking gas.

How to DROP COVER and HOLD ON

DROP to the ground

COVER your head and neck with your arms and shelter under a sturdy desk or table. If there isn’t safe shelter nearby, crouch alongside a bench or an inside wall. HOLD ON to your shelter and be prepared to move with it until the shaking stops

If an earthquake strikes and you are outdoors:

If you are outside, duck, cover and hold on away from things that could fall over or fall down. The more open the space, the better Keep well clear of buildings and other structures, power lines, trees and vehicles If in a vehicle, stop in an open area and listen to your car radio for advice If trapped, do not move about or kick up dust, cover your mouth with a handkerchief or clothing Tap on a pipe or wall so rescuers can locate you, shout only as a last resort as shouting can cause you to inhale dangerous amounts of dust.

If you are at the beach:

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