Invisible Clock

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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.

Any other solutions?:-)