Final answer:
Ruth is discussing a specific expectation for someone to be in their bedroom after a certain time, indicating a bedtime rule.
Step-by-step explanation:
The excerpt from Ruth expresses a clear concern about someone's bedtime and adherence to nighttime rules. The statement "...is supposed to be his bedroom after ten o'clock at night" suggests that the character is asserting a specific rule or expectation about when someone should be in their bedroom, which implies a bedtime rule.
This does not indicate a routine or complaint about staying up late; rather, it's addressing a standard that's expected to be followed.