In 1963 if you went to bed at 8 o'clock at night and set the alarm to get up at 9 o'clock the next morning how many hours of sleep would this permit you to have?
Most alarm clocks of 1963 were 12 hour alarm clocks - they didnot know the difference between am & pm, so you would have atmost 1 hour sleep.There may have been some electronic alarm clocks of 1963 whichdid know about am & pm, in which case they would permit at most13 hours of sleep.