A clock that produces a loud sound or signal at a preset time to wake someone up or alert them to a specific moment.
From alarm (a warning sound or signal) combined with clock, first created as mechanical devices in the 15th century and still used in almost every bedroom today.
The snooze button on alarm clocks is actually based on human sleep psychology—researchers found that people who hit snooze are worse at waking up than those who don't, but we keep hitting it anyway because those nine minutes of 'fake sleep' feel amazing.
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