As a former Flight Attendant, I can tell you I couldn't sleep on a plane either, even though I worked on them 4 days a week. I was always aware or semi aware of people's anxiety about flying and usually offered free alcoholic beverages to those customers to help calm them down. I've also sat with them (totally against safety regulations) during take off and landing and not in my jumpseat. I tried to be good to those with anxiety. Much of my MI didn't hit me until I got out of flying.