Memory shuts off just before sleep

What can we remember from surgery? What do we remember while dropping off - but not quite - asleep? Anesthesiology researchers say that we don't remember much.

Anesthetized patients were played a recording of words and sounds just before they went under. The patients brains were monitored through the whole process using functional magnetic resonance imaging. Although researchers observed brain activity in the part of the brain that recognizes language, the part of the brain that has to untangle language and meaning did not function well. After recovering, patients had difficulty identifying the last things they heard.

This finally proves what I've been telling you for 8 years about dozing off in class. link