The first mechanical alarm clock is credited to Levi Hutchins, an American inventor who created a device in 1787 to wake him up at 4 AM for work. However, there were earlier versions of alarm clocks, such as water clocks in ancient Greece and the "knocker-uppers" who manually woke people up in the early 19th century. It is important to note that the concept of an alarm clock, or any device that wakes someone up at a predetermined time, has likely been around since humans began keeping track of time.
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