When your PC powers into sleep mode, it generally stays in this mode until you actively wake it. But you can also have your PC wake from sleep mode at a time you select, automatically.

This can be very useful if you need your PC to perform downloads that would otherwise take too long during peak usage hours. Perhaps you need other processes to kick off during the early morning hours, before you get into the office? Timers can schedule your PC’s awake hours, based upon your needs.
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https://www.laptopmag.com/articles/how-to-set-pc-wake-timers