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<blockquote data-quote="lclev" data-source="post: 1688570" data-attributes="member: 307555">I had this issue on my mac pro. With Yosemite I had no issues.&nbsp; Then I upgraded to El Capitan and lost the sleep function. I was giving serious thought to going back to Yosemite.&nbsp; It finally straightened out when El Capitan 10.11.1 was released. This may be totally unrelated and a shot in the dark but I noticed you are running Avast! antivirus.&nbsp; This might be causing an issue since it is listed as the process running at the time of the sleep failure.&nbsp; I know antivirus can cause all kinds of funny issues.&nbsp; Most forum members do not run any.&nbsp; It can't hurt to try uninstalling it.I have over 30 years in the Windows world so trust me when I say when I got my first Mac it took a lot of convincing to get me to let go of antivirus installing.&nbsp; And I tried everyone out there for macs with varying degrees of success.&nbsp; What I discovered was the viruses found were for Windows and not macs.&nbsp; All were email attachments that I would have never clicked on anyway.&nbsp; My suggestion would be to uninstall Avast! and use Malwarebytes for Mac to do occasional stand alone scans.&nbsp; I also use some browser plug ins to prevent malware issues like Ghostery, uBlock and Privacy BadgerLisa</blockquote>

[QUOTE="lclev, post: 1688570, member: 307555"] I had this issue on my mac pro. With Yosemite I had no issues. Then I upgraded to El Capitan and lost the sleep function. I was giving serious thought to going back to Yosemite. It finally straightened out when El Capitan 10.11.1 was released. This may be totally unrelated and a shot in the dark but I noticed you are running Avast! antivirus. This might be causing an issue since it is listed as the process running at the time of the sleep failure. I know antivirus can cause all kinds of funny issues. Most forum members do not run any. It can't hurt to try uninstalling it. I have over 30 years in the Windows world so trust me when I say when I got my first Mac it took a lot of convincing to get me to let go of antivirus installing. And I tried everyone out there for macs with varying degrees of success. What I discovered was the viruses found were for Windows and not macs. All were email attachments that I would have never clicked on anyway. My suggestion would be to uninstall Avast! and use Malwarebytes for Mac to do occasional stand alone scans. I also use some browser plug ins to prevent malware issues like Ghostery, uBlock and Privacy Badger Lisa [/QUOTE]

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