My great-aunt is refusing to go to bed even though it is supposed to be her regular sleeping time. The problem is my sister, who was with her these past couple of nights, let her stay up really late! So now she is off schedule and wants to stay up again. I've pulled out her pajamas, turned off all the lights, shut all the doors, and closed all the blinds. What else can I do to encourage her to go to bed? Any suggestions?