I'm trying to remember a TV show episode that takes place inside a model hospital, that's inside the real hospital.
A woman wakes up in the hospital but know bodynobody is in it, apart from a few patients that are being hunted by an unseen force. The woman tries to leave the hospital only to find it is floating in a black cloudy sky. One by one the patients disappear, so the woman jumps off the front steps of the hospital, then wakes up in the real hospital.