https://msdn.microsoft.com/en-us/library/windows/desktop/ms682485(v=vs.85).aspx

The time that the system spends in sleep or hibernation does not count toward the expiration of the timer. The timer is signaled when the cumulative amount of elapsed time the system spends in the waking state matches the timer's due time or period.

Windows Server 2003 and Windows XP:  The time that the system spends in sleep or hibernation counts toward the expiration of the timer.  If the timer expires while the system is sleeping, the timer is signaled immediately when the system wakes.

那就不让电脑休眠不就行了

你可以使用线程来代替定时器啊，线程是后台运行的。