How did the job of knocker-upper come to an end?
Frequently Asked Question about the extinct profession: Knocker-Upper
The job of knocker-upper became obsolete with the introduction of alarm clocks and later, digital and smartphone alarms. As technology advanced, people no longer needed to rely on a human to wake them up at a specific time. The practice also declined with the rise of shift work and 24-hour businesses, as people needed to wake up at different times.