Living room is the whole answer, probably. Cover on at ten does not help if the television is on until midnight and you are talking over it. He is a flock bird, you are the flock, and what he can hear he wants to join.
Light does the same job. A screen, a lamp, a streetlight through a gap in the curtain, a phone. Tiels read light as the clock, and they want somewhere in the region of ten to twelve hours of dark and quiet. A cover over a cage in a room that is still awake gives him the dark and none of the quiet.