[extension]

My son has type one diabetes and is on an insulin pump. Because of this I have to check his blood sugar levels every two hours at night. I rely heavily on my iPhone 4 alarm. Last night went to bed with all my alarms set as usual. None of them went off. I woke up at 8 am in a panic not knowing what I'd find in my sons room. Thankfully he hadn't gone low in the night and died. Instead he was extremely high, which is also bad but not fatal in the short term. But still carries health problems.

My first thought was how irresponsible it is to rely on a consumer gadget for something life critical. But then I wondered, is there is any such thing as mission critical alarm clock that this person could find and afford? Can the average layperseon be expected to understand how various gadgets are prone to fail at such simple tasks? We rely on so many non-industrial grade things to not incidentally kill us: shoes, doorknobs, bubblegum, faucets, etc. Maybe it's reasonable to think of a virtual alarm clock in the same way, especially on a device that tries so hard to look and feel like an elementary object rather than a complex machine.

[WalterBright]

I use a windup mechanical alarm clock for critical wakeups. I've had batteries fail on battery clocks, and the power go out on plugin clocks. The windup ones have never failed me.

[sbierwagen]

Anecdote. A mechanical clock has dozens of moving parts, and is powered by a large, fragile, spring. I wouldn't trust it for anything critical, (which "waking up on time" isn't) but then again, I wouldn't trust any single alarm.

In response to the guy behind you: I did some googling for high-reliability alarm clocks, and didn't find anything relevant. Designing one would be amusing, in the standard vein of engineering humor. (Ha ha, isn't this horribly over-designed.) Redundant power supplies! Integral UPS! Three rad-hard microcontrollers which vote on the correct time! Two displays, in case a LED segment on one fails, and gives you the impression of the wrong time! Costs $5000, and weighs 40 pounds!

[helmutgranda]

This is my point. I take responsibility for not waking up when I was supposed to but from different items listed what is a item that you can fully relay on? I agree on setting multiple alarms in my case but do we have to or how about the testimonial listed above, I can't imagine going all my life having to set 2 or more alarms for everything.