This issue seems to be related to the audio driver, this is what the console logs are showing:
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Sleep/Wakes since boot at 2015-07-11 03:21:52 -0400 :1811 Dark Wake Count in this sleep cycle:68
2015-07-13 13:46:13 -0400 Assertions PID 250(coreaudiod) TurnedOff PreventUserIdleSystemSleep "com.apple.audio.context87.preventuseridlesleep" 00:01:17 id:0x100000381 [System: PrevIdle DeclUser IntPrevDisp kDisp]
Sleep/Wakes since boot at 2015-07-13 12:19:48 -0400 :0 Dark Wake Count in this sleep cycle:0
2015-07-13 15:37:23 -0400 Assertions PID 250(coreaudiod) TurnedOff PreventUserIdleSystemSleep "com.apple.audio.context124.preventuseridlesleep" 00:25:36 id:0x100000933 [System: PrevDisp DeclUser IntPrevDisp kDisp]
2015-07-13 15:37:23 -0400 Assertions PID 250(coreaudiod) Released PreventUserIdleSystemSleep "com.apple.audio.context124.preventuseridlesleep" 00:25:36 id:0x100000933 [System: PrevDisp DeclUser IntPrevDisp kDisp]
I'd love some suggestions on solving this. Is it possible to just disable the audio kernel extension? Since I only run in headless mode, is it possible to disable all of the kernel extensions without major repercussions?
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➜ ~ kextstat | grep -v com.apple
Index Refs Address Size Wired Name (Version) <Linked Against>
133 3 0xffffff7f82e82000 0x5e000 0x5e000 org.virtualbox.kext.VBoxDrv (5.0.0) <7 5 4 3 1>
134 0 0xffffff7f82ee0000 0x8000 0x8000 org.virtualbox.kext.VBoxUSB (5.0.0) <133 75 37 7 5 4 3 1>
135 0 0xffffff7f82ee8000 0x5000 0x5000 org.virtualbox.kext.VBoxNetFlt (5.0.0) <133 7 5 4 3 1>
136 0 0xffffff7f82eed000 0x6000 0x6000 org.virtualbox.kext.VBoxNetAdp (5.0.0) <133 5 4 1>