I saw my newest sleep posture last week: A 40-ish guy sits by the window, his elbow resting on this knee. His head is turned, tilted down and to the left, cradled gently by his own hand. His mouth is agape, a pink tongue protruding ominously. A least he's not snoring.

Of course, the empty seat next to him is the last to be filled by a passenger. She gingerly say at the edge of the seat.