I was out of town when Sunday morning's big quake hit Napa, but from my unofficial Facebook survey, half my friends woke up and freaked the hell out, while the other half boasted of sleeping right through it. But if you want some science behind how many people felt that 6.0-magnitude rumble, check out this infographic from Jawbone. The company pulled data from its health tracking device, Jawbone UP, to see how many people woke up, and how long they stayed awake Sunday morning, and posted its findings on the Jawbone blog.

Based on thousands of UP wearers in the Bay Area, the data team reports, "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 ... 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."

It's also interesting to note that the Jawbone team found 45% of UP wearers who lived within 15 miles of the the quake's epicenter never went back to sleep, which isn't surprising after you're jolted awake that hard.

Last night it was hard for me to sleep, mostly because I'd been following the news of the quake and watching the probability report of another big quake in the next seven days. Luckily, the likelihood of a second large earthquake has dropped from 56% Sunday morning to 29% this morning. 

I reached out to Jawbone to see if the company has follow-up sleep numbers on last night's anxiety-ridden UP users, and will publish those findings when I hear back from them.

Got a tip for The Bold Italic? Email tips@thebolditalic.com. 

[h/t Reddit, image from Thinkstock]