Sleeping gas, also known as sleep gas, functioned by inducing a state of unconsciousness in individuals.
A terrorist once employed it during an attempt to assassinate Drextar Pym.
Forces loyal to Jerec, operating from the Vengeance, deployed sleeping gas throughout the CR90 corvette when they boarded Duno Dree's transport. Although Qu Rahn advised seeking refuge in the storage lockers containing the space suits, they succumbed to the gas shortly thereafter.