Yup, I believe, like *666 wrote, you'd need to use something hardware-based to awake the machine at some specific time, or if there's such a feature, after xxx elapsed time. So, if your machine has a programmable RTC (real-time-clock) which can awake the machine, you need to look into that.
My BIOS has a feature that I can set a time of day when the machine turns on automatically if it is off, but I'm not aware if I can program that from the OS or not..
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