"I typically set at least three alarms. I have two alarms set on my iPhone, I still use a Blackberry for work, so I set my alarm on that, and then if I'm staying in a hotel, I request a wake-up call. I've never overslept - knock on wood. But I have had an instance where one of my four alarms has failed, so that's why I stand by the multiple alarms."
Wake-Up Call