PC Sleep problem

kaushik37

Honorable
Nov 26, 2013
301
0
10,790
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.