I just updated my mac to 10.13.4 from 10.12. I'm running PA 3.2.0. Mac is set to never sleep. Display is set to never sleep. Hard Drive is set to not sleep. If I leave my machine alone, it will stay awake. If I log in with PA, as soon as I exit the PA session, the Mac sits, and then goes to sleep. This behavior did not happen with 10.12.