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Swedish designer Johan Brengesjo has come up with a great solution to this problem. His silent alarm clock doesn't make any sound. Instead, it uses a vibrating ring to wake you up.

The silent clock also has a snooze function. Shake the ring and the alarm stops. However, after each time the ring necessitates more vigorous shaking in order to stop vibrating. Each person wears a ring, and each ring is tied to an alarm, making sure that you don't wake up your significant other.

For the moment, the silent alarm clock is still a concept. Until it's in production, you can try using your cell phone to almost the same effect. The vibration of a cell phone on a desk is usually enough to wake up most people. Another idea would be to strap the cell phone onto you while you sleep, or put it in the pockets of your pajamas.

[via Yanko Design, photos by Johan Brengesjo]

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