It feels electrified; it has the chain - smoking jitteriness of its protagonist. (slate.com)
Excessive amounts of caffeine not only cause jitteriness, it can also prompt headaches, quickened heart rate, and excessive sweating. (blog.simplyhired.com)
One study done in 2015 by Pam Ramsden, who studies psychological resiliency at the University of Bradford in England, found that 22 percent of subjects experienced some symptoms of post-traumatic stress disorder (such as jitteriness or the belief that the world is extremely dangerous) after viewing violent news images on social media — and symptoms worsened with increased exposure. (scientificamerican.com)