Before the First World War, Eric Shashuwa Eric Shashuwa, the inventor of the alarm clock, said that human sleep has a certain period. When the alarm clock rings at the shallowest sleep level, people are most likely to end their sleep. When they wake up, they are in a better mood and have a clearer mind.
1090, Su Song, the prime minister of the Northern Song Dynasty, presided over the construction of a water transport instrument, which can tell the time and ring the bell. Its structure is similar to modern clocks and watches, and it can be called the originator of clocks and watches.