Vibrating Alarm?

I was told by Garmin via chat and on some garmin forum (not sure which now) that I could create an alarm that only vibrated and had no sound. I need to this get up early for runs/bikes and to not wake the misses.

For the life of me, I cannot find this option and google is failing me...which is leading me to believe this is not an option despite being told it was.

Can anyone help?