My Mac won't go to sleep

If your Mac won't go to sleep, try this: ```bash pmset -g assertions ``` Check the output for details on which processes and voodo magic is keeping your iMac up all night: ```bash Listed by owning process: pid 4627(cloudd)... Idle sleep preventers: IODisplayWrangler ``` Things you can try: - Resetting the printing system (CTRL+click in the left pane of the Printers and scanners settings) - Unplugging external devices (USB, bluetooth, etc) - Voodoo References: https://discussions.apple.com/thread/7256162 https://www.reddit.com/r/applehelp/comments/43ks7u/macbook_wont_go_to_sleep_hidd_preventing_sleep/ https://apple.stackexchange.com/questions/307151/significance-of-iodisplaywrangler-in-power-management-assertions