Usually I can tell because he's disoriented but last night, after waking me at 11 and leading me into his bedroom, he made so much sense: "You see, when I wake up in here and you are asleep in there, that's a recipe for nightmares." I laid down next to him and promised to stay until he slept. "But then I'll wake up again, no you: Nightmare." So I said I would stay for a really long time, until I knew he was past nightmares. Next morning I told him I stayed until 2:30. "But why were you there?"