PC Sleep problem

My PC had a problem with the sleep mode. When I press the Sleep key, the computer wakes sometimes after 10 minutes, sometimes after 30 minutes and sometimes after 3 hours automatically. The problem would arise when I try to sleep my PC for 4 hours and by chance after 20 - 30 minutes my PC would turn on automatically. Why is such problem arising? My all other functions of PC are running normally.
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