Which passage from the article best supports the idea that working as a human alarm clock was a good way to make extra money?
Sometimes police officers multitasked while on early morning duty, supplementing their incomes by rapping on windows to awaken customers.
The more customers, the better, of course, but having clients who lived too far apart was disadvantageous.
Alarm clocks are a necessary annoyance for anyone who needs to get up early or make sure a quick nap doesn't turn into an all-day snooze.
It was difficult to run around waking up people all over town within a short timeframe, and impossible to be in two places at once if people in distant areas needed to rise simultaneously.