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The Problem Addressed
Pretty often, of two (or more) people sharing bed or room, one has to get up earlier. Standard sound-based alarm clocks wake up everybody. A silent alarm clock would wake up the early riser only.
Two Key Features of the Silent Alarm Clock
1.Bluetooth Vibrating Wrist Band: the alarm clock would have a bluetooth vibrating wrist band (see an example)
2.Focused Light Beam: the alarm clock would to turn a focused light beam on.
I found a pretty interesting discussion about silent alarm clocks here
Here is a joke solution suggestes by Mercy Vetsel.
The early riser should get one of those CD alarm clocks and set the alarm to play Pink Floyd's "Time" song that starts with a horrific cacophony of discordant alarms. After a few days, the late riser will no longer complain about a normal alarm clock!