Who Invented the Alarm Clock in Ancient Greece?

The invention of the alarm clock is often attributed to Ancient Greece. While the exact inventor is not known, there are many historical accounts that suggest that alarm clocks were used in ancient times.

The Water Clock

One of the earliest forms of an alarm clock was the water clock. This device was invented in Ancient Greece and consisted of a container filled with water that dripped at a steady rate into another container below it.

The container below had markings indicating the passage of time. When the water reached a certain level, it would trigger an alarm.

The Clepsydra

Another type of water clock, called a clepsydra, was also used in Ancient Greece. This device was similar to the water clock but had more advanced features such as multiple containers and mechanisms for regulating the flow of water. It was also used to mark the passage of time during legal proceedings and other important events.

The Greek Alarm Clock

The Greek Alarm Clock was another type of device that was used to wake people up in ancient times. This device consisted of a metal ball that was placed on a metal plate with a hole in it. The ball would roll off the plate when it reached a certain angle, causing a loud noise that would wake up the sleeper.

The Role of Sundials

Sundials were another important invention in Ancient Greece that helped people keep track of time. These devices used the position of the sun to indicate what time it was throughout the day. While not technically an alarm clock, sundials played an important role in helping people schedule their day and wake up on time.


In conclusion, while we may never know exactly who invented the alarm clock in Ancient Greece, there is no doubt that many types of devices were used to wake people up and keep track of time during this period. From water clocks to the Greek Alarm Clock, these devices provided an important service to people in ancient times and laid the foundation for modern alarm clocks that we use today.