As it seems there is a problem with the alarm clock. Again I woke up too late and was sure that I did not turn of the alarm myself.
I discovered something today, when I turned on my 4s it had shown at bottom that "swipe to stop alarm clock" thing and in the middle of screen I could press to snooze. But, there was no alarm sound running and the clock next to the battery icon was missing.
After clicking the snooze button the clock icon appeared again and after about 10 minutes I could hear the alarm sound.
I did not have this every day, but often enough that I will use something else for my wake up alarm from now on...
I discovered something today, when I turned on my 4s it had shown at bottom that "swipe to stop alarm clock" thing and in the middle of screen I could press to snooze. But, there was no alarm sound running and the clock next to the battery icon was missing.
After clicking the snooze button the clock icon appeared again and after about 10 minutes I could hear the alarm sound.
I did not have this every day, but often enough that I will use something else for my wake up alarm from now on...