Wake from hibernation

Wake from hibernation

We have a handful of machines that we use connected to large monitors as presentation/digital signage stations that we would like to be able to have hibernate and turn back on as a scheduled task.  For example I want them to hibernate at 6PM on Monday through Friday then wake up at 6AM Monday through Friday.  What is the best way to accomplish this?  Will the devices need to be connected to the LAN via hard wire or can they be wireless?  Thank in advance for your help.
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