Justice League - “War World part 2”

Green Lantern and Hawkgirl hitch a ride on an alien ship. They are in the back and start to bicker with each other.

Blue alien dude asks if they want privacy, and raises a glass barrier. Alien dude then presses a button, releasing sleeping gas in the back. Hawkgirl and Lantern start to pass out from the gas. Hawkgirl fights it a bit longer, breaking the glass.