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Amazon.com: Super Loud Alarm Clock with Bed Shaker, Vibrating Alarm Clock for Heavy Sleepers Hearing Impaired Deaf Teens, Dual Clock with 7.5'' Large Display, USB Charger, Dimmer, Snooze & Battery Backup :
Do sunrise alarm clocks work? What to know. - The Washington Post
How to Use an Analog Alarm Clock – Cloudnola
How a mechanical alarm clock works
How Do Alarm Clocks Work? | Hunker
How do the alarm clocks work for the deaf? | Claso
The best $17.59 I've ever spent: A totally normal alarm clock - Vox
No more snooze button: a complete guide to waking up feeling fantastic | Sleep | The Guardian