Come on now, get your mind out of the gutter!
The vibrators I'm talking about are these clever alarm clock rings.
Rather than announcing it's time to get out of the sack via a radio or, worse, some horrible buzzer, this alarm clock comes with two rings, which vibrate at the appropriate time.
Each ring can be set for its own wakeup time. Very clever, indeed.
At present, they're just a design concept, but one day ...