IPhone on silent overnight and the alarm doesn't sound?

I just got the iPhone 4S and I always put my phone on silent, but I set an alarm and it didn't sound! Most annoying thing ever.

Make sure the do not disturb is off. Turn it off, then back on.
Make sure volume is up.
I uses Alarmed on my iPad to wake up. Small miracle I woke on my own Thursday as my iPad was completely silent.

I shut down and turned on and it was fine.
Hope yours is too.

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