How do deaf people wake up on time?

Question

Yup... I think this is one of those up front questions.

A link to whatever device you come up with would be appreciated. I'm not finding any "Strobe Clocks"

Answer 1

Vibrating alarm clocks. They go under the pillow.

They sell them here:
http://www.soundclarity.com/vibrating_alarm_clock.asp

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Edited to add:

Flashing light alarms would only work in a room that's pitch black. If you live in, say, an apartment (as opposed to a basement somewhere) and sleep past dawn, a flashing light would not wake you up when light is already pouring into your apartment from every window.

My deaf friends use flashing light alarms when the phone rings, or the doorbell, or when the baby cries (sound activated). Here's an example of a flashing baby monitor:
http://www.abledata.com/abledata.cfm?pageid=19327&top=11967&productid=101635&trail=22,11860&discontinued=0

Answer 2

Some may have a very good "internal clock" which wakes them up at the proper time.

In general I believe that they have the clock connected to a bright lamp which flashes off and on when the alarm activates.