If this goes on for five to seven nights, the original cause -- which may be very legitimate -- has disappeared, but the learned response persists.

I'd like to see sleep be a genuine vital sign that's on the chart, there for the nurse to have to address on every visit, and find out what the patient's been doing about their problem up until then.

We've had people eat their meals in their sleep; prepare meals in their sleep. We've had people have phone conversations in their sleep. We've had people drive long distances in their sleep.