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Message: <blockquote data-quote="mannydac123" data-source="post: 1776572" data-attributes="member: 396744"><p>Help!  My late 2012 iMac, with High Sierra installed, is rebooting every day around the same time.  Generally I'll wake it up after breakfast, do some work, put it to sleep and come back around lunchtime to find it has rebooted with an error message saying it has suffered a Sleep Wake Failure.  Apple haven't been too helpful, taking me thru all the usual SMC / clean disk stuff but not really wanting to address the long diagnostic that comes with the error message, and they say the next step is to reinstall high Sierra.  But I don't think that is going to help, as High Sierra and the Mac in general is working just fine the rest of the day. Thoughts?</p></blockquote><p></p>