Why does the alarm not go off some mornings?

The alarm time in some instances is set for about 6 am or earlier, and I will turn the alarm switch on. However, when I wake up it is 8-9 and my alarm never went off. I sometimes don't set it till later in the evening, such as 12 or 1. Is there some kind of cutoff period where it will cause the alarm to not go off the NEXT time it reaches the set time? (Such as if I was to set it for 6am and turn it on at 2am [theoretically], are the time too close to have it go off?)


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