What types of people hired knocker-uppers?

Knocker-uppers were typically hired by workers who needed to wake up early for their jobs, such as factory workers, miners, and dock workers. They were also hired by individuals who had trouble waking up on their own, such as heavy sleepers or those with irregular sleep schedules. Wealthy families, who could afford the service, also hired knocker-uppers to ensure punctuality for important events or travel.