For some odd reason, my Mac Pro won't sleep by itself. Unlike, this question, it does stay asleep; it just won't go to sleep by itself. I read Why your Mac might not sleep or stay in sleep mode, but to no avail.
I tried pmset -g assertions
and got this:
9/26/13 9:11:36 AM PDT
Assertion status system-wide:
PreventUserIdleDisplaySleep 0
PreventSystemSleep 0
PreventUserIdleSystemSleep 0
ExternalMedia 0
UserIsActive 0
ApplePushServiceTask 0
BackgroundTask 0
And then a whole bunch of kernel assertions that had nothing set. What is going on?