Does the iPhone display turn on when the iPhone is asleep anan alarm sounds

My iPhone was asleep when its alarm sounded. It was in airplane mode (I didn't want someone calling me during the night). When the alarm sounded, I heard the alarm sound and the phone vibrate, but the display itself was still off; I had to press the on/off/sleep button to see it.
Is that as expected?

It's weird -- I set an alarm, put the phone to sleep, and this time the display did turn on when the alarm sounded. Hmm...

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Did you already try to reset the phone by holding the sleep and home button until the Apple logo comes back again?
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Why does my iMac display go off when I am starting up or waking up my machine from sleep..

Why does my iMac display go off when I am starting up or waking up my machine from sleep..?
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<Email Edited by Host>

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Why won´t my display turn off when i call (iphone 4s ios 5.1)??

hi
i have a iphone 4s with ios 5.1
since i updated to 5.1 i have the problem that the display won´t turn off,
when i call with someone.
i have reset the iphone more than one time.
I don´t know what i can do more.
ps: sorry for my englisch

ach nee....
i have no protection on the iphone and i know the display turns only off when i hold it at my ear.
my problem IS that the display won´t turn off when i hold it at my ear.
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http://support.apple.com/kb/TA38625

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Does the iPhone display turn on when the iPhone is asleep anan alarm sounds

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