Yes.
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Most alarm clocks of 1963 were 12 hour alarm clocks - they did not know the difference between am & pm, so you would have at most 1 hour sleep. There may have been some electronic alarm clocks of 1963 which did know about am & pm, in which case they would permit at most 13 hours of sleep.
When the Sun rise up NO. The alarm would go off in an hour because wind up alarm clocks do not have AM and PM settings.
12 pm is noon, 12 am is midnight
With an older alarm clock ... one with hands on the front and a wind-up key in the back ... you get one (1) hour of sleep, because the clock doesn't know the difference between AM and PM. With a more modern LED digital clock, you get thirteen (13) hours; the display has that little dot on the side, so you can tell the difference between AM and PM when you're setting the time or the alarm.
05.20