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How to wake up with an alarm clock
Pick an alarm device.
Wind-up type alarm clocks with bells, clock radios, and even many cell phones and pagers can be set to play an alert that can wake even the deepest sleepers.
Choose alarm type.
Based on the device chosen above, it may be possible to select from 2 or more types of alarm signal. Many clock radios offer choice of a wake alarm consisting of a radio station broadcast (of the user's choice) or a simple buzzer.