I never realized that people in Intensive Care Units slept so badly. Well, of course, with all those alarms, monitors, and interruptions. You might also have more private rooms, where the roommate who wants to turn on soap operas on her hostpital TV doesn't make the person behind the curtain scream because he can't escape poorly written dialogue.

It states some basic facts about a study done to see how much sleep and what quality sleep people get when in the ICU, but it does go much further than that.