"Nervous energy" refers to the anxious or restless feeling that someone experiences when they are excited, worried, or anticipating something. It is a burst of energy that comes from feeling nervous or tense. Full definition
Working in both cities has inspired a sense of exploration and a certain amount of nervous energy in my paintings and drawings. (crosstownarts.org)
Nobody's laughing, and the room is filled with nervous energy. (waytooindie.com)
A combination of the two works well to help control obsessive activity or thinking, repetitive behavior problems like chasing a ball constantly, or dogs with too much nervous energy. (wagbrag.com)