IMac Sleep problems. Mac gets stuck in sleep mode

My iMac has been having Sleep issues for a couple of months now. At First when you put it to sleep, you could hear it was still on. It would take about 15 minutes for it to go to sleep. During this time you could not wake it even by moving the mouse or keyboard. The screen also remained blank.
If you didn’t touch the machine, it would sleep after 15 minutes. If you moved the mouse/keyboard, after 15 minutes it would load to the last position.
Now the problem has worsened. When you put it to sleep the same above happens except it never sleeps. After 15 minutes it wakes itself automatically with the screen remaining blank. Then after 10 minutes or so it will try to go to sleep on its own but you can still hear the machine is on. This process repeats itself continuously. If you try and wake the computer it can take 5 – 10  minutes to come out of the cycle and then it works.
Any ideas?

Hi This is the output.
Mitan-Patels-iMac-239:~ mitanpatel257905$ Assertion status system-wide:
   PreventUserIdleDisplaySleep             0
   CPUBoundAssertion                       0
   DisableInflow                           0
   ChargeInhibit                           0
   PreventSystemSleep                      0
   PreventUserIdleSystemSleep              0
   ExternalMedia                           0
   DisableLowPowerBatteryWarnings          0
   EnableIdleSleep                         1
   NoRealPowerSources_debug                0
   UserIsActive                            0
   ApplePushServiceTask                    0
Kernel Assertions: 0x0012
* Kernel Assertion ID = 500
   Created At = 01/01/1970 01:02:35 GMT+
   Modified At = 03/06/2014 09:20:14 GMT+
   Owner ID = 0xffffff80202a3000
   Level = 255
   Assertions Set = None (4)
* Kernel Assertion ID = 501
   Created At = 01/01/1970 01:02:37 GMT+
   Modified At = 01/01/1970 01:00:00 GMT+
   Owner ID = 0xffffff80202e4000
   Level = 0
   Assertions Set = None (4)
* Kernel Assertion ID = 507
   Created At = -bash: Assertion: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    PreventUserIdleDisplaySleep             0
-bash: PreventUserIdleDisplaySleep: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    CPUBoundAssertion                       0
-bash: CPUBoundAssertion: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    DisableInflow                           0
-bash: DisableInflow: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    ChargeInhibit                           0
-bash: ChargeInhibit: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    PreventSystemSleep                      0
-bash: PreventSystemSleep: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    PreventUserIdleSystemSleep              0
-bash: PreventUserIdleSystemSleep: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    ExternalMedia                           0
-bash: ExternalMedia: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    DisableLowPowerBatteryWarnings          0
-bash: DisableLowPowerBatteryWarnings: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    EnableIdleSleep                         1
-bash: EnableIdleSleep: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    NoRealPowerSources_debug                0
-bash: NoRealPowerSources_debug: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    UserIsActive                            0
-bash: UserIsActive: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    ApplePushServiceTask                    0
-bash: ApplePushServiceTask: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$
Mitan-Patels-iMac-239:~ mitanpatel257905$ Kernel Assertions: 0x0012
-bash: Kernel: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$  * Kernel Assertion ID = 500
-bash: HeM+l%AF%DDpȻِ%CF̓%F4%C8O%DE{%AE2ߤ%D8~%E3%EB%8Cؔ%DA%EF: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Created At = 01/01/1970 01:02:35 GMT+
-bash: Created: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Modified At = 03/06/2014 09:20:14 GMT+
-bash: Modified: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Owner ID = 0xffffff80202a3000
-bash: Owner: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Level = 255
-bash: Level: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Assertions Set = None (4)
-bash: syntax error near unexpected token `('
Mitan-Patels-iMac-239:~ mitanpatel257905$
Mitan-Patels-iMac-239:~ mitanpatel257905$  * Kernel Assertion ID = 501
-bash: HeM+l%AF%DDpȻِ%CF̓%F4%C8O%DE{%AE2ߤ%D8~%E3%EB%8Cؔ%DA%EF: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Created At = 01/01/1970 01:02:37 GMT+
-bash: Created: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Modified At = 01/01/1970 01:00:00 GMT+
-bash: Modified: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Owner ID = 0xffffff80202e4000
-bash: Owner: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Level = 0
-bash: Level: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Assertions Set = None (4)
-bash: syntax error near unexpected token `('
Mitan-Patels-iMac-239:~ mitanpatel257905$
Mitan-Patels-iMac-239:~ mitanpatel257905$  * Kernel Assertion ID = 507
-bash: HeM+l%AF%DDpȻِ%CF̓%F4%C8O%DE{%AE2ߤ%D8~%E3%EB%8Cؔ%DA%EF: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Created At = 03/06/2014 18:40:04 GMT+
-bash: Created: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Modified At = 01/01/1970 01:00:00 GMT+
-bash: Modified: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Owner ID = 0xffffff80249e2a00
-bash: Owner: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Level = 255
-bash: Level: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Assertions Set = None (8)
-bash: syntax error near unexpected token `('
Mitan-Patels-iMac-239:~ mitanpatel257905$
Mitan-Patels-iMac-239:~ mitanpatel257905$  * Kernel Assertion ID = 508
-bash: HeM+l%AF%DDpȻِ%CF̓%F4%C8O%DE{%AE2ߤ%D8~%E3%EB%8Cؔ%DA%EF: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Created At = 04/06/2014 00:00:07 GMT+
-bash: Created: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Modified At = 01/01/1970 01:00:00 GMT+
-bash: Modified: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Owner ID = 0xffffff803813c800
-bash: Owner: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Level = 255
-bash: Level: command not found
Mitan-Patels-iMac-239:~ mitanpatel257905$    Assertions Set = None (8)
-bash: syntax error near unexpected token `('

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