I try to awaken Jeremy without waking Luke, but Jer is hard to awaken. I usually go in and rub his leg until he murmurs, then I tell him, "We need to leave in 25 minutes. Say it. (If he doesn't speak, he isn't really awake)".
From the bottom bunk I hear, "We need to leave in 25 minutes. Only I don't have to get up. I am still asleep."