Sleeping/Waking up problem?

So this has happened to me too many times before. I set a total of 7 alarms on my iphone and placed it on my bedside before going to sleep. I woke up to the sound of my mom telling me to wake up but no alarm and this was an hour after I set my alarm. I checked my phone and all the alarms were off so that ment that I had opened my phone with the passcode and turned off all of the alarms. Also the network was turned off witch i never turn off so I really don't understand what's happening here.

I got a total of 7 hour sleep and I don't remember any of this.

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