After Downloading Mountain Lion IMAC is having bluetooth sleep issues.

After downloading Mountain Lion my 21" IMAC is fine untill it goes into sleep mode for an extended period of time.  When I try to wake the IMAC with the Bluetooth keyboard or mouse it will not wake up.  I have to hold the power button down for 5 seconds.  This does not happen untill the IMAC has been in sleep mode for a wihile (I don't know the amount of time) but if I am at the IMAC and it goes into sleep I and wake it with know problem it has to sleep for a while for the issue to kick in.
Thanks

Open Disk Utilities (Applications - Utilities - Disk Utilities) and run Repair Disk Permissions and then restart the computer and retest.

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