Why is the Guru Granth sahib kept in a room?
The Guru Granth Sahib is the embodiment of all the of previous gurus, Guru Gobind Singh Ji commanded that the Guru Granth Sahib be our guru after him. The Guru Granth Sahib isn't though of as a book, it is thought of as a Guru, a person. Notice that the Guru Granth Sahib does not have page number, but aangs (body parts). As every indiviudual has a room in which they sleep, the Guru Granth Sahib has a room to rest in as well.