Deaf People - The Great Mystery

How do deaf people wake up on time? One theory is they turn the volume up really loud on the alarm. I doubt that works if they're deaf though, unless the point is to piss of the neighbor so he comes and pulls you out of bed. Does anyone know what kind of alarms deaf people use? How does it alert them? Is it painful? Sorry if I offended any deaf people...I'm sure they get tired of hearing stuff like this.

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