He went to bed at 10 p.m.,
wound his alarm clock and set it for noon the next day.
Since Jon fell asleep almost immediately,
How many hours of sleep did he get before the alarm woke him?
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Two Hours of Sleep.Bcoz the alarm clock that required winding,
Have only 12 hours and cant identify between noon and midnight.
So the alarm went off at 12 midnight giving him 2 hours of sleep.