Sleep Issues w/ new 27" iMac

as title indicates having issue new 27" imac waking sleep. have stock 2.7 i5 added 8gb of ram 12gb total -- connected thunderbolt display well.

have been having issues computer not responding after it's been in sleep extended period -- overnight. have wind turning computer off , on wake up. know machine still running when doesn't respond hear hard drive power down hold power button restart.

called apple , took me through rudeimentry things , had me repair permissions on hard drive in disk utility. yet yesterday morning computer locked again. seems putting hard drive sleep cause of problem appears ok if disable 'put hard drive sleep' in power save menu.

ideas or on appreciated...

 

you may find useful ideas here:

mac os x: why mac might not sleep or stay in sleep mode
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one sleep problem caused printers - solved ... and another

 

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