That's a song about spacial and psychical restriction. About people, who can not leave their houses due to certain phobias and trepidations or people who are trapped in their own mind. Some people, who realize their weakness, or better, their fears, give themselves up and let their fears take control over their lifes. And there are some that create their own demons without having any problems just because of a maybe boring life. Try to accept, often natural, fears is sometimes the best way for a healing process.