Q: Just go to sleep!!!

At the moment I'm really hating my Mac Mini. It has just decided in recent weeks that it does not want to go to sleep. I've tried removing all USB connections but still it wants to stay awake. What happens is it'll go to sleep and then a split second later it'll quickly wake up and then basically continue this process thereafter.

Any ideas or help would be greatly appreciated.

Here's the Terminal report:

Alans-Mac-Mini:~ alan$ pmset -g assertions

2016-07-31 22:26:25 +0100

Assertion status system-wide:

   BackgroundTask                 0

   ApplePushServiceTask           0

   UserIsActive                   1

   PreventUserIdleDisplaySleep    0

   PreventSystemSleep             0

   ExternalMedia                  1

   PreventUserIdleSystemSleep     0

   NetworkClientActive            0

Listed by owning process:

   pid 99(hidd): [0x000091f6000914df] 00:00:54 UserIsActive named: "com.apple.iohideventsystem.queue.tickle"

  Timeout will fire in 576 secs Action=TimeoutActionRelease

   pid 53(powerd): [0x000000040008012c] 17:17:57 ExternalMedia named: "com.apple.powermanagement.externalmediamounted"

Kernel Assertions: 0xc=USB,BT-HID

   id=501  level=255 0x4=USB mod=01/01/1970, 01:00 description=com.apple.usb.externaldevice.14200000 owner=Elements 1023

   id=502  level=255 0x4=USB mod=01/01/1970, 01:00 description=com.apple.usb.externaldevice.14500000 owner=My Passport 0820

   id=503  level=255 0x4=USB mod=01/01/1970, 01:00 description=com.apple.usb.externaldevice.1d130000 owner=USB2.0 Hub

   id=504  level=255 0x4=USB mod=01/01/1970, 01:00 description=com.apple.usb.externaldevice.1d133000 owner=USB2.0 Hub

   id=505  level=255 0x4=USB mod=01/01/1970, 01:00 description=com.apple.usb.externaldevice.1d134000 owner=USB2.0 Hub

   id=506  level=255 0x4=USB mod=01/01/1970, 01:00 description=com.apple.usb.externaldevice.1d133400 owner=NovaT 500Stick

   id=507  level=255 0x4=USB mod=01/01/1970, 01:00 description=com.apple.usb.externaldevice.1d134400 owner=HL-2250DN series

   id=570  level=255 0x8=BT-HID mod=01/01/1970, 01:00 description=com.apple.driver.IOBluetoothHIDDriver owner=BNBTrackpadDevice

   id=571  level=255 0x8=BT-HID mod=01/01/1970, 01:00 description=com.apple.driver.IOBluetoothHIDDriver owner=AppleBluetoothHIDKeyboard

Idle sleep preventers: IODisplayWrangler

Alans-Mac-Mini:~ alan$

Here's the Console report:

31/07/2016 22:22:53.024 AirPlayUIAgent[419]: 2016-07-31 10:22:53.023573 PM [AirPlayUIAgent] BecomingInactive: NSWorkspaceWillSleepNotification

31/07/2016 22:22:53.057 TogglDesktop[14511]: receiveSleepNote: NSWorkspaceWillSleepNotification

31/07/2016 22:23:17.000 kernel[0]: Opened file /var/log/SleepWakeStacks.bin, size 172032, extents 1, maxio 2000000 ssd 1

31/07/2016 22:23:17.000 kernel[0]: ARPT: 37238.992738: AirPort_Brcm43xx::powerChange: System Sleep

31/07/2016 22:23:18.000 kernel[0]: ARPT: 37239.492789: IOPMPowerSource Information: onSleep,  SleepType: Normal Sleep,

31/07/2016 22:23:24.000 kernel[0]: 037241.561166 PRT2@14200000: AppleUSBHostPort::setPowerStateGated: kPowerStateOn -> kPowerStateSleep

31/07/2016 22:23:24.000 kernel[0]: 037241.561399 PRT5@14500000: AppleUSBHostPort::setPowerStateGated: kPowerStateOn -> kPowerStateSleep

31/07/2016 22:23:24.000 kernel[0]: Previous sleep cause: 5

31/07/2016 22:23:24.000 kernel[0]: 037242.918892 PRT2@14200000: AppleUSBHostPort::setPowerStateGated: kPowerStateSleep -> kPowerStateOn

31/07/2016 22:23:24.000 kernel[0]: 037242.918897 PRT5@14500000: AppleUSBHostPort::setPowerStateGated: kPowerStateSleep -> kPowerStateOn

31/07/2016 22:23:31.000 kernel[0]: ARPT: 37250.204525: IOPMPowerSource Information: onWake,  SleepType: Normal Sleep,

31/07/2016 22:24:25.000 kernel[0]: ARPT: 37304.463655: AirPort_Brcm43xx::powerChange: System Sleep

31/07/2016 22:24:26.000 kernel[0]: ARPT: 37304.965648: IOPMPowerSource Information: onSleep,  SleepType: Normal Sleep,

31/07/2016 22:24:33.000 kernel[0]: 037308.099059 PRT5@14500000: AppleUSBHostPort::setPowerStateGated: kPowerStateOn -> kPowerStateSleep

31/07/2016 22:24:33.000 kernel[0]: 037308.146483 PRT2@14200000: AppleUSBHostPort::setPowerStateGated: kPowerStateOn -> kPowerStateSleep

31/07/2016 22:24:33.000 kernel[0]: Previous sleep cause: 5

31/07/2016 22:24:33.000 kernel[0]: 037308.288851 PRT2@14200000: AppleUSBHostPort::setPowerStateGated: kPowerStateSleep -> kPowerStateOn

31/07/2016 22:24:33.000 kernel[0]: 037308.289049 PRT5@14500000: AppleUSBHostPort::setPowerStateGated: kPowerStateSleep -> kPowerStateOn

31/07/2016 22:24:38.000 kernel[0]: ARPT: 37313.510999: IOPMPowerSource Information: onWake,  SleepType: Normal Sleep,

31/07/2016 22:25:20.457 WindowServer[207]: handle_will_sleep_auth_and_shield_windows: Deferring.