"During the day, we are presented with this facade." GLaDOS didn't bother to point out the room; he could glean that information for himself, and if he couldn't, he wasn't worth her time. "As soon as we are put away to sleep for the night, the doors unlock and we are granted full access to all the floors of the hospital. At the same time, the Head Doctor taunts us over the intercom, a voice aids us over the radio, and monsters flood the halls to kill or maim anything they run across." She paused, having nearly run out of breath. Her lung capacity was not at its maximum. "Most are mortal; some are not. Those that aren't typically protect key rooms or items. Our own mortality is frank during the night, and anyone who believes they are powerful enough to walk through without harm is almost certain to be killed."

... she still had another plate of food. GLaDOS detached herself from the conversation and went back to eating.