Before alarm clocks were invented, there were ,knocker-ups, who went tapping on client's windows with long sticks until they were awake.

Before alarm clocks were invented, there were ,knocker-ups, who went tapping on client's windows with long sticks until they were awake.

Before alarm clocks were invented, there were ,knocker-ups, who went tapping on client's windows with long sticks until they were awake.