My iPhone 5s didn't vibrate when it came back on?

So my phone was dead for a few hours because I forgot to charge it over night. Which is probably 5 hours? And usually when it's dead and it come back on it vibrates (which every iPhone generation phone does) but tot day that didn't happen and I thought maybe it was just that one time but I tested it out to see if it happened again and it did so anyone got a idea as to what's wrong with my phone?

My 6 will do similar things - sometimes vibrate when I plug it in to charge, or turn it back on, for example, sometimes not. The phone works fine, and eventually fixes itself. Unless you have other problems - no worries.

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